64138631338 has 16 divisors (see below), whose sum is σ = 96440944896. Its totient is φ = 31991712480.

The previous prime is 64138631309. The next prime is 64138631369. The reversal of 64138631338 is 83313683146.

It is a super-2 number, since 2×64138631338² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2218645 + ... + 2247367.

It is an arithmetic number, because the mean of its divisors is an integer number (6027559056).

Almost surely, 2^64138631338 is an apocalyptic number.

64138631338 is a deficient number, since it is larger than the sum of its proper divisors (32302313558).

64138631338 is a wasteful number, since it uses less digits than its factorization.

64138631338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31389.

The product of its digits is 746496, while the sum is 46.

The spelling of 64138631338 in words is "sixty-four billion, one hundred thirty-eight million, six hundred thirty-one thousand, three hundred thirty-eight".