161609768808 has 32 divisors (see below), whose sum is σ = 404054753760. Its totient is φ = 53865878720.

The previous prime is 161609768759. The next prime is 161609768953. The reversal of 161609768808 is 808867906161.

It is a super-2 number, since 2×161609768808² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82666 + ... + 574502.

It is an arithmetic number, because the mean of its divisors is an integer number (12626711055).

Almost surely, 2^161609768808 is an apocalyptic number.

It is an amenable number.

161609768808 is an abundant number, since it is smaller than the sum of its proper divisors (242444984952).

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

161609768808 is a wasteful number, since it uses less digits than its factorization.

161609768808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505537 (or 505533 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 60.

The spelling of 161609768808 in words is "one hundred sixty-one billion, six hundred nine million, seven hundred sixty-eight thousand, eight hundred eight".