64806511986 has 24 divisors (see below), whose sum is σ = 140447228844. Its totient is φ = 21597075360.

The previous prime is 64806511951. The next prime is 64806511997. The reversal of 64806511986 is 68911560846.

64806511986 is a `hidden beast` number, since 6 + 48 + 0 + 6 + 511 + 9 + 86 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 52801146225 + 12005365761 = 229785^2 + 109569^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345781 + ... + 499176.

Almost surely, 2^64806511986 is an apocalyptic number.

64806511986 is an abundant number, since it is smaller than the sum of its proper divisors (75640716858).

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

64806511986 is a wasteful number, since it uses less digits than its factorization.

64806511986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849226 (or 849223 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 64806511986 in words is "sixty-four billion, eight hundred six million, five hundred eleven thousand, nine hundred eighty-six".