64699489947959 has 4 divisors (see below), whose sum is σ = 64752392230416. Its totient is φ = 64646587665504.

The previous prime is 64699489947949. The next prime is 64699489947971. The reversal of 64699489947959 is 95974998499646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64699489947959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64699489947949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26451139394 + ... + 26451141839.

It is an arithmetic number, because the mean of its divisors is an integer number (16188098057604).

Almost surely, 2^{64699489947959} is an apocalyptic number.

64699489947959 is a deficient number, since it is larger than the sum of its proper divisors (52902282457).

64699489947959 is a wasteful number, since it uses less digits than its factorization.

64699489947959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52902282456.

The product of its digits is 342843217920, while the sum is 98.

The spelling of 64699489947959 in words is "sixty-four trillion, six hundred ninety-nine billion, four hundred eighty-nine million, nine hundred forty-seven thousand, nine hundred fifty-nine".