64698864139 has 48 divisors (see below), whose sum is σ = 83619793600. Its totient is φ = 48742518528.

The previous prime is 64698864133. The next prime is 64698864169. The reversal of 64698864139 is 93146889646.

It is a happy number.

It is not a de Polignac number, because 64698864139 - 2¹⁷ = 64698733067 is a prime.

It is a super-2 number, since 2×64698864139² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64698864133) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11020897 + ... + 11026765.

Almost surely, 2^64698864139 is an apocalyptic number.

64698864139 is a deficient number, since it is larger than the sum of its proper divisors (18920929461).

64698864139 is a wasteful number, since it uses less digits than its factorization.

64698864139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6164 (or 6141 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 64.

The spelling of 64698864139 in words is "sixty-four billion, six hundred ninety-eight million, eight hundred sixty-four thousand, one hundred thirty-nine".