64697639434 has 16 divisors (see below), whose sum is σ = 99374428800. Its totient is φ = 31578964560.

The previous prime is 64697639401. The next prime is 64697639443. The reversal of 64697639434 is 43493679646.

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, 1512462 + ... + 1554649.

It is an arithmetic number, because the mean of its divisors is an integer number (6210901800).

Almost surely, 2^64697639434 is an apocalyptic number.

64697639434 is a deficient number, since it is larger than the sum of its proper divisors (34676789366).

64697639434 is a wasteful number, since it uses less digits than its factorization.

64697639434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3067365.

The product of its digits is 70543872, while the sum is 61.

The spelling of 64697639434 in words is "sixty-four billion, six hundred ninety-seven million, six hundred thirty-nine thousand, four hundred thirty-four".