161122562620 has 72 divisors (see below), whose sum is σ = 357586185600. Its totient is φ = 60919125120.

The previous prime is 161122562609. The next prime is 161122562633. The reversal of 161122562620 is 26265221161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1076106 + ... + 1216654.

It is an arithmetic number, because the mean of its divisors is an integer number (4966474800).

Almost surely, 2^161122562620 is an apocalyptic number.

161122562620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161122562620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178793092800).

161122562620 is an abundant number, since it is smaller than the sum of its proper divisors (196463622980).

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

161122562620 is a wasteful number, since it uses less digits than its factorization.

161122562620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140675 (or 140630 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 161122562620 its reverse (26265221161), we get a palindrome (187387783781).

The spelling of 161122562620 in words is "one hundred sixty-one billion, one hundred twenty-two million, five hundred sixty-two thousand, six hundred twenty".