138781527805832 has 32 divisors (see below), whose sum is σ = 275536650223800. Its totient is φ = 65305517359104.

The previous prime is 138781527805787. The next prime is 138781527805841. The reversal of 138781527805832 is 238508725187831.

It can be written as a sum of positive squares in 4 ways, for example, as 137855918334436 + 925609471396 = 11741206^2 + 962086^2 .

It is a Harshad number since it is a multiple of its sum of digits (68).

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, 24256073 + ... + 29426520.

Almost surely, 2^{138781527805832} is an apocalyptic number.

It is an amenable number.

138781527805832 is a deficient number, since it is larger than the sum of its proper divisors (136755122417968).

138781527805832 is a wasteful number, since it uses less digits than its factorization.

138781527805832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53701625 (or 53701621 counting only the distinct ones).

The product of its (nonzero) digits is 180633600, while the sum is 68.

The spelling of 138781527805832 in words is "one hundred thirty-eight trillion, seven hundred eighty-one billion, five hundred twenty-seven million, eight hundred five thousand, eight hundred thirty-two".