138454689025 has 9 divisors (see below), whose sum is σ = 171686121411. Its totient is φ = 110762262840.

The previous prime is 138454688971. The next prime is 138454689059. The reversal of 138454689025 is 520986454831.

The square root of 138454689025 is 372095.

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., 49843688049 + 88611000976 = 223257^2 + 297676^2 .

It is a de Polignac number, because none of the positive numbers 2^k-138454689025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1823266 + ... + 1897684.

Almost surely, 2^138454689025 is an apocalyptic number.

138454689025 is the 372095-th square number.

138454689025 is the 186048-th centered octagonal number.

It is an amenable number.

138454689025 is a deficient number, since it is larger than the sum of its proper divisors (33231432386).

138454689025 is an frugal number, since it uses more digits than its factorization.

138454689025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148848 (or 74424 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 55.

The spelling of 138454689025 in words is "one hundred thirty-eight billion, four hundred fifty-four million, six hundred eighty-nine thousand, twenty-five".