161641556 has 12 divisors (see below), whose sum is σ = 283520160. Its totient is φ = 80635800.

The previous prime is 161641549. The next prime is 161641561. The reversal of 161641556 is 655146161.

161641556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161641556² = 52255985252202272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44270 + ... + 47781.

It is an arithmetic number, because the mean of its divisors is an integer number (23626680).

Almost surely, 2^161641556 is an apocalyptic number.

It is an amenable number.

161641556 is a deficient number, since it is larger than the sum of its proper divisors (121878604).

161641556 is a wasteful number, since it uses less digits than its factorization.

161641556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92494 (or 92492 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 161641556 is about 12713.8332535864. The cubic root of 161641556 is about 544.7338217071.

The spelling of 161641556 in words is "one hundred sixty-one million, six hundred forty-one thousand, five hundred fifty-six".