161577756664576 has 72 divisors (see below), whose sum is σ = 373648562589344. Its totient is φ = 68299012546560.

The previous prime is 161577756664487. The next prime is 161577756664613. The reversal of 161577756664576 is 675466657775161.

It is a happy number.

It is a super-2 number, since 2×161577756664576² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161577756664496 and 161577756664505.

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, 617445615 + ... + 617707246.

Almost surely, 2^{161577756664576} is an apocalyptic number.

161577756664576 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161577756664576 is an abundant number, since it is smaller than the sum of its proper divisors (212070805924768).

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

161577756664576 is an equidigital number, since it uses as much as digits as its factorization.

161577756664576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235152957 (or 1235152943 counting only the distinct ones).

The product of its digits is 9335088000, while the sum is 79.

The spelling of 161577756664576 in words is "one hundred sixty-one trillion, five hundred seventy-seven billion, seven hundred fifty-six million, six hundred sixty-four thousand, five hundred seventy-six".