25480779129 has 27 divisors (see below), whose sum is σ = 39864291597. Its totient is φ = 15676648416.

The previous prime is 25480779073. The next prime is 25480779131. The reversal of 25480779129 is 92197708452.

The square root of 25480779129 is 159627.

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

25480779129 is a `hidden beast` number, since 2 + 5 + 480 + 77 + 91 + 2 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5362193529 + 20118585600 = 73227^2 + 141840^2 .

It is not a de Polignac number, because 25480779129 - 2²⁹ = 24943908217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25480779169) 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, 6223407 + ... + 6227499.

Almost surely, 2^25480779129 is an apocalyptic number.

25480779129 is the 159627-th square number.

25480779129 is the 79814-th centered octagonal number.

It is an amenable number.

25480779129 is a deficient number, since it is larger than the sum of its proper divisors (14383512468).

25480779129 is an frugal number, since it uses more digits than its factorization.

25480779129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8218 (or 4109 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

It can be divided in two parts, 25480 and 779129, that added together give a square (804609 = 897²).

The spelling of 25480779129 in words is "twenty-five billion, four hundred eighty million, seven hundred seventy-nine thousand, one hundred twenty-nine".