161555752 has 16 divisors (see below), whose sum is σ = 313362900. Its totient is φ = 77992320.

The previous prime is 161555729. The next prime is 161555759. The reversal of 161555752 is 257555161.

It can be written as a sum of positive squares in 2 ways, for example, as 154405476 + 7150276 = 12426^2 + 2674^2 .

It is a super-2 number, since 2×161555752² = 52200522008571008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161555759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347949 + ... + 348412.

Almost surely, 2^161555752 is an apocalyptic number.

It is an amenable number.

161555752 is a deficient number, since it is larger than the sum of its proper divisors (151807148).

161555752 is a wasteful number, since it uses less digits than its factorization.

161555752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696396 (or 696392 counting only the distinct ones).

The product of its digits is 52500, while the sum is 37.

The square root of 161555752 is about 12710.4583709637. The cubic root of 161555752 is about 544.6374178392.

The spelling of 161555752 in words is "one hundred sixty-one million, five hundred fifty-five thousand, seven hundred fifty-two".