138868206464 has 32 divisors (see below), whose sum is σ = 297932393640. Its totient is φ = 64093017600.

The previous prime is 138868206457. The next prime is 138868206479. The reversal of 138868206464 is 464602868831.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41725562 + ... + 41728889.

Almost surely, 2^138868206464 is an apocalyptic number.

It is an amenable number.

138868206464 is an abundant number, since it is smaller than the sum of its proper divisors (159064187176).

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

138868206464 is an equidigital number, since it uses as much as digits as its factorization.

138868206464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83454478 (or 83454466 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 56.

The spelling of 138868206464 in words is "one hundred thirty-eight billion, eight hundred sixty-eight million, two hundred six thousand, four hundred sixty-four".