161222325624 has 96 divisors (see below), whose sum is σ = 448630387920. Its totient is φ = 52266705408.

The previous prime is 161222325623. The next prime is 161222325653. The reversal of 161222325624 is 426523222161.

161222325624 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 2 + 2 + 3 + 25 + 624 = 666.

161222325624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 401525²-1.

It is a super-2 number, since 2×161222325624² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161222325623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7216279 + ... + 7238585.

Almost surely, 2^161222325624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161222325624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224315193960).

161222325624 is an abundant number, since it is smaller than the sum of its proper divisors (287408062296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161222325624 is a wasteful number, since it uses less digits than its factorization.

161222325624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25069 (or 25062 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

Adding to 161222325624 its reverse (426523222161), we get a palindrome (587745547785).

The spelling of 161222325624 in words is "one hundred sixty-one billion, two hundred twenty-two million, three hundred twenty-five thousand, six hundred twenty-four".