161125556 has 24 divisors (see below), whose sum is σ = 286513920. Its totient is φ = 79271712.

The previous prime is 161125469. The next prime is 161125577. The reversal of 161125556 is 655521161.

It is a super-2 number, since 2×161125556² = 51922889592618272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117185 + ... + 118551.

It is an arithmetic number, because the mean of its divisors is an integer number (11938080).

Almost surely, 2^161125556 is an apocalyptic number.

It is an amenable number.

161125556 is a deficient number, since it is larger than the sum of its proper divisors (125388364).

161125556 is a wasteful number, since it uses less digits than its factorization.

161125556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1821 counting only the distinct ones).

The product of its digits is 9000, while the sum is 32.

The square root of 161125556 is about 12693.5241757362. The cubic root of 161125556 is about 544.1535619320.

The spelling of 161125556 in words is "one hundred sixty-one million, one hundred twenty-five thousand, five hundred fifty-six".