64136168173938 has 64 divisors (see below), whose sum is σ = 146729258387712. Its totient is φ = 18308083415040.

The previous prime is 64136168173933. The next prime is 64136168173967. The reversal of 64136168173938 is 83937186163146.

It is a super-2 number, since 2×64136168173938² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64136168173933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1688085870 + ... + 1688123862.

It is an arithmetic number, because the mean of its divisors is an integer number (2292644662308).

Almost surely, 2^{64136168173938} is an apocalyptic number.

64136168173938 is an abundant number, since it is smaller than the sum of its proper divisors (82593090213774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64136168173938 is a wasteful number, since it uses less digits than its factorization.

64136168173938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73219.

The product of its digits is 94058496, while the sum is 66.

The spelling of 64136168173938 in words is "sixty-four trillion, one hundred thirty-six billion, one hundred sixty-eight million, one hundred seventy-three thousand, nine hundred thirty-eight".