64999999999986 has 32 divisors (see below), whose sum is σ = 132208456737600. Its totient is φ = 21298618693440.

The previous prime is 64999999999933. The next prime is 64999999999993. The reversal of 64999999999986 is 68999999999946.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5765316 + ... + 12776496.

It is an arithmetic number, because the mean of its divisors is an integer number (4131514273050).

Almost surely, 2^{64999999999986} is an apocalyptic number.

64999999999986 is an abundant number, since it is smaller than the sum of its proper divisors (67208456737614).

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

64999999999986 is a wasteful number, since it uses less digits than its factorization.

64999999999986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037434.

The product of its digits is 4016775629952, while the sum is 114.

The spelling of 64999999999986 in words is "sixty-four trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-six".