64399696138 has 4 divisors (see below), whose sum is σ = 96599544210. Its totient is φ = 32199848068.

The previous prime is 64399696117. The next prime is 64399696139. The reversal of 64399696138 is 83169699346.

64399696138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 47383276329 + 17016419809 = 217677^2 + 130447^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64399696138.

It is not an unprimeable number, because it can be changed into a prime (64399696139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16099924033 + ... + 16099924036.

Almost surely, 2^64399696138 is an apocalyptic number.

64399696138 is a deficient number, since it is larger than the sum of its proper divisors (32199848072).

64399696138 is a wasteful number, since it uses less digits than its factorization.

64399696138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32199848071.

The product of its digits is 45349632, while the sum is 64.

The spelling of 64399696138 in words is "sixty-four billion, three hundred ninety-nine million, six hundred ninety-six thousand, one hundred thirty-eight".