138840081864 has 32 divisors (see below), whose sum is σ = 378654769440. Its totient is φ = 42072752000.

The previous prime is 138840081823. The next prime is 138840081907. The reversal of 138840081864 is 468180048831.

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, 262954437 + ... + 262954964.

It is an arithmetic number, because the mean of its divisors is an integer number (11832961545).

Almost surely, 2^138840081864 is an apocalyptic number.

It is an amenable number.

138840081864 is an abundant number, since it is smaller than the sum of its proper divisors (239814687576).

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

138840081864 is a wasteful number, since it uses less digits than its factorization.

138840081864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525909421 (or 525909417 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 51.

The spelling of 138840081864 in words is "one hundred thirty-eight billion, eight hundred forty million, eighty-one thousand, eight hundred sixty-four".