25715798929 has 4 divisors (see below), whose sum is σ = 26004740580. Its totient is φ = 25426857280.

The previous prime is 25715798917. The next prime is 25715798939. The reversal of 25715798929 is 92989751752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15209548929 + 10506250000 = 123327^2 + 102500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25715798929 is a prime.

It is a super-2 number, since 2×25715798929² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25715798939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144470692 + ... + 144470869.

It is an arithmetic number, because the mean of its divisors is an integer number (6501185145).

Almost surely, 2^25715798929 is an apocalyptic number.

It is an amenable number.

25715798929 is a deficient number, since it is larger than the sum of its proper divisors (288941651).

25715798929 is an equidigital number, since it uses as much as digits as its factorization.

25715798929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288941650.

The product of its digits is 28576800, while the sum is 64.

The spelling of 25715798929 in words is "twenty-five billion, seven hundred fifteen million, seven hundred ninety-eight thousand, nine hundred twenty-nine".