138877711569 has 45 divisors (see below), whose sum is σ = 212208112171. Its totient is φ = 90512389440.

The previous prime is 138877711559. The next prime is 138877711571. The reversal of 138877711569 is 965117778831.

The square root of 138877711569 is 372663.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 24363151569 + 114514560000 = 156087^2 + 338400^2 .

It is not a de Polignac number, because 138877711569 - 2²⁷ = 138743493841 is a prime.

It is a super-2 number, since 2×138877711569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138877711559) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 157636009 + ... + 157636889.

Almost surely, 2^138877711569 is an apocalyptic number.

138877711569 is the 372663-rd square number.

138877711569 is the 186332-nd centered octagonal number.

It is an amenable number.

138877711569 is a deficient number, since it is larger than the sum of its proper divisors (73330400602).

138877711569 is an frugal number, since it uses more digits than its factorization.

138877711569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868 (or 931 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 63.

The spelling of 138877711569 in words is "one hundred thirty-eight billion, eight hundred seventy-seven million, seven hundred eleven thousand, five hundred sixty-nine".