138644007502 has 64 divisors (see below), whose sum is σ = 283804835328. Its totient is φ = 49044528000.

The previous prime is 138644007497. The next prime is 138644007511. The reversal of 138644007502 is 205700446831.

It is a congruent number.

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, 445524 + ... + 689767.

It is an arithmetic number, because the mean of its divisors is an integer number (4434450552).

Almost surely, 2^138644007502 is an apocalyptic number.

138644007502 is an abundant number, since it is smaller than the sum of its proper divisors (145160827826).

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

138644007502 is a wasteful number, since it uses less digits than its factorization.

138644007502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135385.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 138644007502 in words is "one hundred thirty-eight billion, six hundred forty-four million, seven thousand, five hundred two".