64991815316 has 24 divisors (see below), whose sum is σ = 113894126976. Its totient is φ = 32450673600.

The previous prime is 64991815297. The next prime is 64991815327. The reversal of 64991815316 is 61351819946.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10709315 + ... + 10715381.

It is an arithmetic number, because the mean of its divisors is an integer number (4745588624).

Almost surely, 2^64991815316 is an apocalyptic number.

It is an amenable number.

64991815316 is a deficient number, since it is larger than the sum of its proper divisors (48902311660).

64991815316 is a wasteful number, since it uses less digits than its factorization.

64991815316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9359 (or 9357 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 53.

The spelling of 64991815316 in words is "sixty-four billion, nine hundred ninety-one million, eight hundred fifteen thousand, three hundred sixteen".