138752554640 has 40 divisors (see below), whose sum is σ = 368685360960. Its totient is φ = 47572304256.

The previous prime is 138752554597. The next prime is 138752554693. The reversal of 138752554640 is 46455257831.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123885650 + ... + 123886769.

It is an arithmetic number, because the mean of its divisors is an integer number (9217134024).

Almost surely, 2^138752554640 is an apocalyptic number.

138752554640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138752554640 is an abundant number, since it is smaller than the sum of its proper divisors (229932806320).

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

138752554640 is a wasteful number, since it uses less digits than its factorization.

138752554640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247772439 (or 247772433 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 50.

The spelling of 138752554640 in words is "one hundred thirty-eight billion, seven hundred fifty-two million, five hundred fifty-four thousand, six hundred forty".