25464818929 has 27 divisors (see below), whose sum is σ = 28483022379. Its totient is φ = 22749297120.

The previous prime is 25464818927. The next prime is 25464819049. The reversal of 25464818929 is 92981846452.

It is a happy number.

The square root of 25464818929 is 159577.

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., 4889785329 + 20575033600 = 69927^2 + 143440^2 .

It is not a de Polignac number, because 25464818929 - 2¹ = 25464818927 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25464818921) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 156225802 + ... + 156225964.

Almost surely, 2^25464818929 is an apocalyptic number.

25464818929 is the 159577-th square number.

25464818929 is the 79789-th centered octagonal number.

It is an amenable number.

25464818929 is a deficient number, since it is larger than the sum of its proper divisors (3018203450).

25464818929 is an frugal number, since it uses more digits than its factorization.

25464818929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 263 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 58.

The spelling of 25464818929 in words is "twenty-five billion, four hundred sixty-four million, eight hundred eighteen thousand, nine hundred twenty-nine".