664787615187 has 8 divisors (see below), whose sum is σ = 886852728720. Its totient is φ = 442957122560.

The previous prime is 664787615183. The next prime is 664787615197. The reversal of 664787615187 is 781516787466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664787615187 - 2² = 664787615183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664787615183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58648614 + ... + 58659947.

It is an arithmetic number, because the mean of its divisors is an integer number (110856591090).

Almost surely, 2^664787615187 is an apocalyptic number.

664787615187 is a deficient number, since it is larger than the sum of its proper divisors (222065113533).

664787615187 is a wasteful number, since it uses less digits than its factorization.

664787615187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117310453.

The product of its digits is 94832640, while the sum is 66.

The spelling of 664787615187 in words is "six hundred sixty-four billion, seven hundred eighty-seven million, six hundred fifteen thousand, one hundred eighty-seven".