64139957245 has 16 divisors (see below), whose sum is σ = 94729783680. Its totient is φ = 40598478144.

The previous prime is 64139957213. The next prime is 64139957251. The reversal of 64139957245 is 54275993146.

It is not a de Polignac number, because 64139957245 - 2⁵ = 64139957213 is a prime.

It is a super-2 number, since 2×64139957245² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70483015 + ... + 70483924.

It is an arithmetic number, because the mean of its divisors is an integer number (5920611480).

Almost surely, 2^64139957245 is an apocalyptic number.

64139957245 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64139957245 is a deficient number, since it is larger than the sum of its proper divisors (30589826435).

64139957245 is a wasteful number, since it uses less digits than its factorization.

64139957245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140966964.

The product of its digits is 8164800, while the sum is 55.

The spelling of 64139957245 in words is "sixty-four billion, one hundred thirty-nine million, nine hundred fifty-seven thousand, two hundred forty-five".