61285618188 has 72 divisors (see below), whose sum is σ = 172662300720. Its totient is φ = 18214917120.

The previous prime is 61285618153. The next prime is 61285618193. The reversal of 61285618188 is 88181658216.

61285618188 is a `hidden beast` number, since 6 + 1 + 2 + 8 + 5 + 618 + 18 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2623633 + ... + 2646888.

It is an arithmetic number, because the mean of its divisors is an integer number (2398087510).

Almost surely, 2^61285618188 is an apocalyptic number.

61285618188 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

61285618188 is an abundant number, since it is smaller than the sum of its proper divisors (111376682532).

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

61285618188 is a wasteful number, since it uses less digits than its factorization.

61285618188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270567 (or 5270562 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 54.

The spelling of 61285618188 in words is "sixty-one billion, two hundred eighty-five million, six hundred eighteen thousand, one hundred eighty-eight".