138947665956 has 24 divisors (see below), whose sum is σ = 353684968224. Its totient is φ = 42105353280.

The previous prime is 138947665943. The next prime is 138947665973. The reversal of 138947665956 is 659566749831.

It is a super-2 number, since 2×138947665956² (a number of 23 digits) contains 22 as substring.

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, 526316785 + ... + 526317048.

It is an arithmetic number, because the mean of its divisors is an integer number (14736873676).

Almost surely, 2^138947665956 is an apocalyptic number.

It is an amenable number.

138947665956 is an abundant number, since it is smaller than the sum of its proper divisors (214737302268).

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

138947665956 is a wasteful number, since it uses less digits than its factorization.

138947665956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052633851 (or 1052633849 counting only the distinct ones).

The product of its digits is 293932800, while the sum is 69.

The spelling of 138947665956 in words is "one hundred thirty-eight billion, nine hundred forty-seven million, six hundred sixty-five thousand, nine hundred fifty-six".