138742531257 has 16 divisors (see below), whose sum is σ = 206729449920. Its totient is φ = 82035494400.

The previous prime is 138742531247. The next prime is 138742531259. The reversal of 138742531257 is 752135247831.

It is not a de Polignac number, because 138742531257 - 2¹⁰ = 138742530233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138742531259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51270832 + ... + 51273537.

It is an arithmetic number, because the mean of its divisors is an integer number (12920590620).

Almost surely, 2^138742531257 is an apocalyptic number.

It is an amenable number.

138742531257 is a deficient number, since it is larger than the sum of its proper divisors (67986918663).

138742531257 is a wasteful number, since it uses less digits than its factorization.

138742531257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102544424.

The product of its digits is 1411200, while the sum is 48.

The spelling of 138742531257 in words is "one hundred thirty-eight billion, seven hundred forty-two million, five hundred thirty-one thousand, two hundred fifty-seven".