64723139725 has 12 divisors (see below), whose sum is σ = 80368338240. Its totient is φ = 51706482800.

The previous prime is 64723139699. The next prime is 64723139731. The reversal of 64723139725 is 52793132746.

It is not a de Polignac number, because 64723139725 - 2⁵ = 64723139693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1782391 + ... + 1818340.

It is an arithmetic number, because the mean of its divisors is an integer number (6697361520).

Almost surely, 2^64723139725 is an apocalyptic number.

It is an amenable number.

64723139725 is a deficient number, since it is larger than the sum of its proper divisors (15645198515).

64723139725 is a wasteful number, since it uses less digits than its factorization.

64723139725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601460 (or 3601455 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 49.

The spelling of 64723139725 in words is "sixty-four billion, seven hundred twenty-three million, one hundred thirty-nine thousand, seven hundred twenty-five".