25116526661 has 4 divisors (see below), whose sum is σ = 25117514400. Its totient is φ = 25115538924.

The previous prime is 25116526639. The next prime is 25116526667. The reversal of 25116526661 is 16662561152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25116526661 - 2²⁶ = 25049417797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25116526667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454691 + ... + 506928.

It is an arithmetic number, because the mean of its divisors is an integer number (6279378600).

Almost surely, 2^25116526661 is an apocalyptic number.

It is an amenable number.

25116526661 is a deficient number, since it is larger than the sum of its proper divisors (987739).

25116526661 is an equidigital number, since it uses as much as digits as its factorization.

25116526661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987738.

The product of its digits is 129600, while the sum is 41.

The spelling of 25116526661 in words is "twenty-five billion, one hundred sixteen million, five hundred twenty-six thousand, six hundred sixty-one".