138755621454220 has 96 divisors (see below), whose sum is σ = 315708939076608. Its totient is φ = 51021506952192.

The previous prime is 138755621454199. The next prime is 138755621454251. The reversal of 138755621454220 is 22454126557831.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1110809007 + ... + 1110933913.

It is an arithmetic number, because the mean of its divisors is an integer number (3288634782048).

Almost surely, 2^{138755621454220} is an apocalyptic number.

138755621454220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138755621454220 is an abundant number, since it is smaller than the sum of its proper divisors (176953317622388).

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

138755621454220 is a wasteful number, since it uses less digits than its factorization.

138755621454220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200959 (or 200957 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 55.

The spelling of 138755621454220 in words is "one hundred thirty-eight trillion, seven hundred fifty-five billion, six hundred twenty-one million, four hundred fifty-four thousand, two hundred twenty".