138781775527055 has 16 divisors (see below), whose sum is σ = 167514825045504. Its totient is φ = 110375072962560.

The previous prime is 138781775526883. The next prime is 138781775527103. The reversal of 138781775527055 is 550725577187831.

It is not a de Polignac number, because 138781775527055 - 2²⁴ = 138781758749839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138781775527055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47464004 + ... + 50303033.

It is an arithmetic number, because the mean of its divisors is an integer number (10469676565344).

Almost surely, 2^{138781775527055} is an apocalyptic number.

138781775527055 is a deficient number, since it is larger than the sum of its proper divisors (28733049518449).

138781775527055 is a wasteful number, since it uses less digits than its factorization.

138781775527055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97768706.

The product of its (nonzero) digits is 576240000, while the sum is 71.

The spelling of 138781775527055 in words is "one hundred thirty-eight trillion, seven hundred eighty-one billion, seven hundred seventy-five million, five hundred twenty-seven thousand, fifty-five".