64139738990 has 16 divisors (see below), whose sum is σ = 115522085952. Its totient is φ = 25640216544.

The previous prime is 64139738981. The next prime is 64139739017. The reversal of 64139738990 is 9983793146.

It is a super-2 number, since 2×64139738990² (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 7 ways as a sum of consecutive naturals, for example, 1942694 + ... + 1975433.

It is an arithmetic number, because the mean of its divisors is an integer number (7220130372).

Almost surely, 2^64139738990 is an apocalyptic number.

64139738990 is a deficient number, since it is larger than the sum of its proper divisors (51382346962).

64139738990 is a wasteful number, since it uses less digits than its factorization.

64139738990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3919771.

The product of its (nonzero) digits is 8817984, while the sum is 59.

The spelling of 64139738990 in words is "sixty-four billion, one hundred thirty-nine million, seven hundred thirty-eight thousand, nine hundred ninety".