64697639416 has 8 divisors (see below), whose sum is σ = 121308073920. Its totient is φ = 32348819704.

The previous prime is 64697639401. The next prime is 64697639443. The reversal of 64697639416 is 61493679646.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4043602456 + ... + 4043602471.

It is an arithmetic number, because the mean of its divisors is an integer number (15163509240).

Almost surely, 2^64697639416 is an apocalyptic number.

It is an amenable number.

64697639416 is a deficient number, since it is larger than the sum of its proper divisors (56610434504).

64697639416 is a wasteful number, since it uses less digits than its factorization.

64697639416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8087204933 (or 8087204929 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 61.

The spelling of 64697639416 in words is "sixty-four billion, six hundred ninety-seven million, six hundred thirty-nine thousand, four hundred sixteen".