161610402772 has 48 divisors (see below), whose sum is σ = 351337150080. Its totient is φ = 63336258432.

The previous prime is 161610402713. The next prime is 161610402791. The reversal of 161610402772 is 277204016161.

It is a super-2 number, since 2×161610402772² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2035747 + ... + 2113642.

It is an arithmetic number, because the mean of its divisors is an integer number (7319523960).

Almost surely, 2^161610402772 is an apocalyptic number.

It is an amenable number.

161610402772 is an abundant number, since it is smaller than the sum of its proper divisors (189726747308).

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

161610402772 is a wasteful number, since it uses less digits than its factorization.

161610402772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4149520 (or 4149518 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 161610402772 in words is "one hundred sixty-one billion, six hundred ten million, four hundred two thousand, seven hundred seventy-two".