25116265721 has 16 divisors (see below), whose sum is σ = 26005716480. Its totient is φ = 24243684480.

The previous prime is 25116265703. The next prime is 25116265739. The reversal of 25116265721 is 12756261152.

It is an interprime number because it is at equal distance from previous prime (25116265703) and next prime (25116265739).

It is a cyclic number.

It is not a de Polignac number, because 25116265721 - 2²² = 25112071417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25116265621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2178845 + ... + 2190341.

It is an arithmetic number, because the mean of its divisors is an integer number (1625357280).

Almost surely, 2^25116265721 is an apocalyptic number.

It is an amenable number.

25116265721 is a deficient number, since it is larger than the sum of its proper divisors (889450759).

25116265721 is a wasteful number, since it uses less digits than its factorization.

25116265721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12224.

The product of its digits is 50400, while the sum is 38.

The spelling of 25116265721 in words is "twenty-five billion, one hundred sixteen million, two hundred sixty-five thousand, seven hundred twenty-one".