161280556 has 6 divisors (see below), whose sum is σ = 282240980. Its totient is φ = 80640276.

The previous prime is 161280541. The next prime is 161280599. The reversal of 161280556 is 655082161.

It is a happy number.

161280556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161280556² = 52022835487338272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20160066 + ... + 20160073.

Almost surely, 2^161280556 is an apocalyptic number.

It is an amenable number.

161280556 is a deficient number, since it is larger than the sum of its proper divisors (120960424).

161280556 is a wasteful number, since it uses less digits than its factorization.

161280556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40320143 (or 40320141 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 161280556 is about 12699.6281835336. The cubic root of 161280556 is about 544.3279947840.

The spelling of 161280556 in words is "one hundred sixty-one million, two hundred eighty thousand, five hundred fifty-six".