138878088221512 has 8 divisors (see below), whose sum is σ = 260396415415350. Its totient is φ = 69439044110752.

The previous prime is 138878088221473. The next prime is 138878088221539. The reversal of 138878088221512 is 215122880878831.

It can be written as a sum of positive squares in only one way, i.e., 131393628842436 + 7484459379076 = 11462706^2 + 2735774^2 .

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

It is a super-2 number, since 2×138878088221512² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8679880513837 + ... + 8679880513852.

Almost surely, 2^{138878088221512} is an apocalyptic number.

It is an amenable number.

138878088221512 is a deficient number, since it is larger than the sum of its proper divisors (121518327193838).

138878088221512 is a wasteful number, since it uses less digits than its factorization.

138878088221512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17359761027695 (or 17359761027691 counting only the distinct ones).

The product of its (nonzero) digits is 27525120, while the sum is 64.

The spelling of 138878088221512 in words is "one hundred thirty-eight trillion, eight hundred seventy-eight billion, eighty-eight million, two hundred twenty-one thousand, five hundred twelve".