161655688 has 8 divisors (see below), whose sum is σ = 303104430. Its totient is φ = 80827840.

The previous prime is 161655677. The next prime is 161655709. The reversal of 161655688 is 886556161.

It can be written as a sum of positive squares in only one way, i.e., 82410084 + 79245604 = 9078^2 + 8902^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×161655688² = 52265122925506688, which 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, 10103473 + ... + 10103488.

Almost surely, 2^161655688 is an apocalyptic number.

It is an amenable number.

161655688 is a deficient number, since it is larger than the sum of its proper divisors (141448742).

161655688 is a wasteful number, since it uses less digits than its factorization.

161655688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20206967 (or 20206963 counting only the distinct ones).

The product of its digits is 345600, while the sum is 46.

The square root of 161655688 is about 12714.3890140266. The cubic root of 161655688 is about 544.7496962430.

The spelling of 161655688 in words is "one hundred sixty-one million, six hundred fifty-five thousand, six hundred eighty-eight".