64693015623 has 6 divisors (see below), whose sum is σ = 93445467024. Its totient is φ = 43128677076.

The previous prime is 64693015577. The next prime is 64693015631. The reversal of 64693015623 is 32651039646.

64693015623 is a `hidden beast` number, since 6 + 4 + 6 + 9 + 3 + 0 + 15 + 623 = 666.

It is not a de Polignac number, because 64693015623 - 2²⁰ = 64691967047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64693014623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3594056415 + ... + 3594056432.

It is an arithmetic number, because the mean of its divisors is an integer number (15574244504).

Almost surely, 2^64693015623 is an apocalyptic number.

64693015623 is a deficient number, since it is larger than the sum of its proper divisors (28752451401).

64693015623 is a wasteful number, since it uses less digits than its factorization.

64693015623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7188112853 (or 7188112850 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 64693015623 in words is "sixty-four billion, six hundred ninety-three million, fifteen thousand, six hundred twenty-three".