138621635358 has 32 divisors (see below), whose sum is σ = 278208794880. Its totient is φ = 46046569920.

The previous prime is 138621635311. The next prime is 138621635371. The reversal of 138621635358 is 853536126831.

It is a self number, because there is not a number n which added to its sum of digits gives 138621635358.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1988253 + ... + 2056791.

It is an arithmetic number, because the mean of its divisors is an integer number (8694024840).

Almost surely, 2^138621635358 is an apocalyptic number.

138621635358 is an abundant number, since it is smaller than the sum of its proper divisors (139587159522).

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

138621635358 is a wasteful number, since it uses less digits than its factorization.

138621635358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69712.

The product of its digits is 3110400, while the sum is 51.

The spelling of 138621635358 in words is "one hundred thirty-eight billion, six hundred twenty-one million, six hundred thirty-five thousand, three hundred fifty-eight".