161222012010 has 96 divisors (see below), whose sum is σ = 437830585920. Its totient is φ = 42683148288.

The previous prime is 161222011921. The next prime is 161222012047. The reversal of 161222012010 is 10210222161.

161222012010 is a `hidden beast` number, since 1 + 612 + 2 + 20 + 1 + 20 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99114 + ... + 576426.

It is an arithmetic number, because the mean of its divisors is an integer number (4560735270).

Almost surely, 2^161222012010 is an apocalyptic number.

161222012010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161222012010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218915292960).

161222012010 is an abundant number, since it is smaller than the sum of its proper divisors (276608573910).

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

161222012010 is a wasteful number, since it uses less digits than its factorization.

161222012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477474 (or 477462 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 161222012010 its reverse (10210222161), we get a palindrome (171432234171).

The spelling of 161222012010 in words is "one hundred sixty-one billion, two hundred twenty-two million, twelve thousand, ten".