661150575756 has 72 divisors (see below), whose sum is σ = 1919129284800. Its totient is φ = 189803990880.

The previous prime is 661150575733. The next prime is 661150575773. The reversal of 661150575756 is 657575051166.

661150575756 is a `hidden beast` number, since 6 + 6 + 1 + 15 + 0 + 57 + 575 + 6 = 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, 43928586 + ... + 43943633.

It is an arithmetic number, because the mean of its divisors is an integer number (26654573400).

Almost surely, 2^661150575756 is an apocalyptic number.

661150575756 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

661150575756 is an abundant number, since it is smaller than the sum of its proper divisors (1257978709044).

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

661150575756 is a wasteful number, since it uses less digits than its factorization.

661150575756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87872259 (or 87872254 counting only the distinct ones).

The product of its (nonzero) digits is 6615000, while the sum is 54.

The spelling of 661150575756 in words is "six hundred sixty-one billion, one hundred fifty million, five hundred seventy-five thousand, seven hundred fifty-six".