138775002638 has 4 divisors (see below), whose sum is σ = 208162503960. Its totient is φ = 69387501318.

The previous prime is 138775002617. The next prime is 138775002643. The reversal of 138775002638 is 836200577831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34693750658 + ... + 34693750661.

It is an arithmetic number, because the mean of its divisors is an integer number (52040625990).

Almost surely, 2^138775002638 is an apocalyptic number.

138775002638 is a deficient number, since it is larger than the sum of its proper divisors (69387501322).

138775002638 is an equidigital number, since it uses as much as digits as its factorization.

138775002638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69387501321.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 138775002638 in words is "one hundred thirty-eight billion, seven hundred seventy-five million, two thousand, six hundred thirty-eight".