138278878862500 has 36 divisors (see below), whose sum is σ = 302465688496020. Its totient is φ = 55311551540000.

The previous prime is 138278878862429. The next prime is 138278878862519. The reversal of 138278878862500 is 5268878872831.

It can be written as a sum of positive squares in 6 ways, for example, as 92133160354404 + 46145718508096 = 9598602^2 + 6793064^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5531142655 + ... + 5531167654.

It is an arithmetic number, because the mean of its divisors is an integer number (8401824680445).

Almost surely, 2^{138278878862500} is an apocalyptic number.

138278878862500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138278878862500 is an abundant number, since it is smaller than the sum of its proper divisors (164186809633520).

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

138278878862500 is an equidigital number, since it uses as much as digits as its factorization.

138278878862500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11062310338 (or 11062310316 counting only the distinct ones).

The product of its (nonzero) digits is 578027520, while the sum is 73.

The spelling of 138278878862500 in words is "one hundred thirty-eight trillion, two hundred seventy-eight billion, eight hundred seventy-eight million, eight hundred sixty-two thousand, five hundred".