161042556 has 48 divisors (see below), whose sum is σ = 396556160. Its totient is φ = 50725440.

The previous prime is 161042509. The next prime is 161042561. The reversal of 161042556 is 655240161.

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 15 ways as a sum of consecutive naturals, for example, 129570 + ... + 130806.

Almost surely, 2^161042556 is an apocalyptic number.

It is an amenable number.

161042556 is an abundant number, since it is smaller than the sum of its proper divisors (235513604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161042556 is a wasteful number, since it uses less digits than its factorization.

161042556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834 (or 1832 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 161042556 is about 12690.2543709730. The cubic root of 161042556 is about 544.0601099596.

The spelling of 161042556 in words is "one hundred sixty-one million, forty-two thousand, five hundred fifty-six".