129973172265 has 80 divisors (see below), whose sum is σ = 237581885376. Its totient is φ = 67954723200.

The previous prime is 129973172239. The next prime is 129973172279. The reversal of 129973172265 is 562271379921.

129973172265 is a `hidden beast` number, since 12 + 9 + 97 + 317 + 226 + 5 = 666.

It is not a de Polignac number, because 129973172265 - 2⁵ = 129973172233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 43164610 + ... + 43167620.

Almost surely, 2^129973172265 is an apocalyptic number.

129973172265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129973172265 is a deficient number, since it is larger than the sum of its proper divisors (107608713111).

129973172265 is a wasteful number, since it uses less digits than its factorization.

129973172265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5092 (or 5083 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

It can be divided in two parts, 1299731 and 72265, that added together give a triangular number (1371996 = T₁₆₅₆).

The spelling of 129973172265 in words is "one hundred twenty-nine billion, nine hundred seventy-three million, one hundred seventy-two thousand, two hundred sixty-five".