161637546656 has 12 divisors (see below), whose sum is σ = 318223920042. Its totient is φ = 80818773312.

The previous prime is 161637546641. The next prime is 161637546661. The reversal of 161637546656 is 656645736161.

It can be written as a sum of positive squares in only one way, i.e., 120867475600 + 40770071056 = 347660^2 + 201916^2 .

It is a super-2 number, since 2×161637546656² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2525586635 + ... + 2525586698.

Almost surely, 2^161637546656 is an apocalyptic number.

161637546656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161637546656 is a deficient number, since it is larger than the sum of its proper divisors (156586373386).

161637546656 is an equidigital number, since it uses as much as digits as its factorization.

161637546656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051173343 (or 5051173335 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 56.

The spelling of 161637546656 in words is "one hundred sixty-one billion, six hundred thirty-seven million, five hundred forty-six thousand, six hundred fifty-six".