64172786475 has 24 divisors (see below), whose sum is σ = 121256008960. Its totient is φ = 29336130720.

The previous prime is 64172786453. The next prime is 64172786477. The reversal of 64172786475 is 57468727146.

It is not a de Polignac number, because 64172786475 - 2¹⁰ = 64172785451 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64172786477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61116415 + ... + 61117464.

Almost surely, 2^64172786475 is an apocalyptic number.

64172786475 is a deficient number, since it is larger than the sum of its proper divisors (57083222485).

64172786475 is a wasteful number, since it uses less digits than its factorization.

64172786475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122233899 (or 122233894 counting only the distinct ones).

The product of its digits is 15805440, while the sum is 57.

The spelling of 64172786475 in words is "sixty-four billion, one hundred seventy-two million, seven hundred eighty-six thousand, four hundred seventy-five".