25784972929 has 9 divisors (see below), whose sum is σ = 26054455233. Its totient is φ = 25518254532.

The previous prime is 25784972909. The next prime is 25784972953. The reversal of 25784972929 is 92927948752.

The square root of 25784972929 is 160577.

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

It is not a de Polignac number, because 25784972929 - 2²³ = 25776584321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25784972909) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16538652 + ... + 16540210.

Almost surely, 2^25784972929 is an apocalyptic number.

25784972929 is the 160577-th square number.

25784972929 is the 80289-th centered octagonal number.

It is an amenable number.

25784972929 is a deficient number, since it is larger than the sum of its proper divisors (269482304).

25784972929 is an frugal number, since it uses more digits than its factorization.

25784972929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324 (or 1662 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 64.

Multiplying 25784972929 by its sum of digits (64), we get a square (1650238267456 = 1284616²).

The spelling of 25784972929 in words is "twenty-five billion, seven hundred eighty-four million, nine hundred seventy-two thousand, nine hundred twenty-nine".