138521292488 has 8 divisors (see below), whose sum is σ = 259727423430. Its totient is φ = 69260646240.

The previous prime is 138521292487. The next prime is 138521292541. The reversal of 138521292488 is 884292125831.

138521292488 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 105418401124 + 33102891364 = 324682^2 + 181942^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138521292487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8657580773 + ... + 8657580788.

Almost surely, 2^138521292488 is an apocalyptic number.

It is an amenable number.

138521292488 is a deficient number, since it is larger than the sum of its proper divisors (121206130942).

138521292488 is a wasteful number, since it uses less digits than its factorization.

138521292488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17315161567 (or 17315161563 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The spelling of 138521292488 in words is "one hundred thirty-eight billion, five hundred twenty-one million, two hundred ninety-two thousand, four hundred eighty-eight".