64937698509 has 8 divisors (see below), whose sum is σ = 86739046560. Its totient is φ = 43214074736.

The previous prime is 64937698411. The next prime is 64937698517. The reversal of 64937698509 is 90589673946.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64937698509 - 2⁸ = 64937698253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64937698509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64937698519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19429119 + ... + 19432460.

It is an arithmetic number, because the mean of its divisors is an integer number (10842380820).

Almost surely, 2^64937698509 is an apocalyptic number.

It is an amenable number.

64937698509 is a deficient number, since it is larger than the sum of its proper divisors (21801348051).

64937698509 is a wasteful number, since it uses less digits than its factorization.

64937698509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38862139.

The product of its (nonzero) digits is 88179840, while the sum is 66.

The spelling of 64937698509 in words is "sixty-four billion, nine hundred thirty-seven million, six hundred ninety-eight thousand, five hundred nine".