56615115618 has 64 divisors (see below), whose sum is σ = 131433649920. Its totient is φ = 18030266496.

The previous prime is 56615115611. The next prime is 56615115619. The reversal of 56615115618 is 81651151665.

56615115618 is a `hidden beast` number, since 5 + 6 + 6 + 15 + 1 + 15 + 618 = 666.

It is not an unprimeable number, because it can be changed into a prime (56615115611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1063246 + ... + 1115222.

It is an arithmetic number, because the mean of its divisors is an integer number (2053650780).

Almost surely, 2^56615115618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56615115618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65716824960).

56615115618 is an abundant number, since it is smaller than the sum of its proper divisors (74818534302).

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

56615115618 is a wasteful number, since it uses less digits than its factorization.

56615115618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52888 (or 52882 counting only the distinct ones).

The product of its digits is 216000, while the sum is 45.

The spelling of 56615115618 in words is "fifty-six billion, six hundred fifteen million, one hundred fifteen thousand, six hundred eighteen".