664818086187 has 32 divisors (see below), whose sum is σ = 991001157120. Its totient is φ = 440479620000.

The previous prime is 664818086159. The next prime is 664818086221. The reversal of 664818086187 is 781680818466.

664818086187 is a `hidden beast` number, since 6 + 6 + 4 + 8 + 1 + 8 + 0 + 8 + 618 + 7 = 666.

It is not a de Polignac number, because 664818086187 - 2⁷ = 664818086059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664818036187) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3910362 + ... + 4076832.

It is an arithmetic number, because the mean of its divisors is an integer number (30968786160).

Almost surely, 2^664818086187 is an apocalyptic number.

664818086187 is a deficient number, since it is larger than the sum of its proper divisors (326183070933).

664818086187 is a wasteful number, since it uses less digits than its factorization.

664818086187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167392 (or 167386 counting only the distinct ones).

The product of its (nonzero) digits is 24772608, while the sum is 63.

The spelling of 664818086187 in words is "six hundred sixty-four billion, eight hundred eighteen million, eighty-six thousand, one hundred eighty-seven".