161610556 has 12 divisors (see below), whose sum is σ = 284382280. Its totient is φ = 80358480.

The previous prime is 161610511. The next prime is 161610557. The reversal of 161610556 is 655016161.

It is a super-2 number, since 2×161610556² = 52235943621258272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161610557) 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, 110886 + ... + 112333.

Almost surely, 2^161610556 is an apocalyptic number.

It is an amenable number.

161610556 is a deficient number, since it is larger than the sum of its proper divisors (122771724).

161610556 is a wasteful number, since it uses less digits than its factorization.

161610556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223404 (or 223402 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161610556 is about 12712.6140506192. The cubic root of 161610556 is about 544.6989960337.

It can be divided in two parts, 1616105 and 56, that added together give a palindrome (1616161).

The spelling of 161610556 in words is "one hundred sixty-one million, six hundred ten thousand, five hundred fifty-six".