138257621698 has 16 divisors (see below), whose sum is σ = 237061940544. Its totient is φ = 59241047760.

The previous prime is 138257621629. The next prime is 138257621807. The reversal of 138257621698 is 896126752831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947740 + ... + 1083847.

It is an arithmetic number, because the mean of its divisors is an integer number (14816371284).

Almost surely, 2^138257621698 is an apocalyptic number.

138257621698 is a deficient number, since it is larger than the sum of its proper divisors (98804318846).

138257621698 is a wasteful number, since it uses less digits than its factorization.

138257621698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036457.

The product of its digits is 8709120, while the sum is 58.

The spelling of 138257621698 in words is "one hundred thirty-eight billion, two hundred fifty-seven million, six hundred twenty-one thousand, six hundred ninety-eight".