64168213937 has 4 divisors (see below), whose sum is σ = 64346955840. Its totient is φ = 63989472036.

The previous prime is 64168213933. The next prime is 64168214009. The reversal of 64168213937 is 73931286146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73931286146 = 2 ⋅36965643073.

It is a cyclic number.

It is not a de Polignac number, because 64168213937 - 2² = 64168213933 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64168213933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89370413 + ... + 89371130.

It is an arithmetic number, because the mean of its divisors is an integer number (16086738960).

Almost surely, 2^64168213937 is an apocalyptic number.

It is an amenable number.

64168213937 is a deficient number, since it is larger than the sum of its proper divisors (178741903).

64168213937 is a wasteful number, since it uses less digits than its factorization.

64168213937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178741902.

The product of its digits is 1306368, while the sum is 50.

The spelling of 64168213937 in words is "sixty-four billion, one hundred sixty-eight million, two hundred thirteen thousand, nine hundred thirty-seven".