138773699656 has 8 divisors (see below), whose sum is σ = 260200686870. Its totient is φ = 69386849824.

The previous prime is 138773699653. The next prime is 138773699699. The reversal of 138773699656 is 656996377831.

It can be written as a sum of positive squares in only one way, i.e., 101537822500 + 37235877156 = 318650^2 + 192966^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×138773699656³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138773699653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8673356221 + ... + 8673356236.

Almost surely, 2^138773699656 is an apocalyptic number.

It is an amenable number.

138773699656 is a deficient number, since it is larger than the sum of its proper divisors (121426987214).

138773699656 is a wasteful number, since it uses less digits than its factorization.

138773699656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17346712463 (or 17346712459 counting only the distinct ones).

The product of its digits is 308629440, while the sum is 70.

The spelling of 138773699656 in words is "one hundred thirty-eight billion, seven hundred seventy-three million, six hundred ninety-nine thousand, six hundred fifty-six".