56081618 has 4 divisors (see below), whose sum is σ = 84122430. Its totient is φ = 28040808.

The previous prime is 56081609. The next prime is 56081629. The reversal of 56081618 is 81618065.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81618065 = 5 ⋅16323613.

It can be written as a sum of positive squares in only one way, i.e., 32296489 + 23785129 = 5683^2 + 4877^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14020403 + ... + 14020406.

Almost surely, 2^56081618 is an apocalyptic number.

56081618 is a deficient number, since it is larger than the sum of its proper divisors (28040812).

56081618 is a wasteful number, since it uses less digits than its factorization.

56081618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28040811.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 56081618 is about 7488.7661199960. The cubic root of 56081618 is about 382.7720149206.

The spelling of 56081618 in words is "fifty-six million, eighty-one thousand, six hundred eighteen".