138521011774 has 4 divisors (see below), whose sum is σ = 207781517664. Its totient is φ = 69260505886.

The previous prime is 138521011751. The next prime is 138521011789. The reversal of 138521011774 is 477110125831.

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, 34630252942 + ... + 34630252945.

It is an arithmetic number, because the mean of its divisors is an integer number (51945379416).

Almost surely, 2^138521011774 is an apocalyptic number.

138521011774 is a deficient number, since it is larger than the sum of its proper divisors (69260505890).

138521011774 is an equidigital number, since it uses as much as digits as its factorization.

138521011774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69260505889.

The product of its (nonzero) digits is 47040, while the sum is 40.

The spelling of 138521011774 in words is "one hundred thirty-eight billion, five hundred twenty-one million, eleven thousand, seven hundred seventy-four".