25885874921 has 2 divisors, whose sum is σ = 25885874922. Its totient is φ = 25885874920.

The previous prime is 25885874869. The next prime is 25885874941. The reversal of 25885874921 is 12947858852.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15510211600 + 10375663321 = 124540^2 + 101861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25885874921 is a prime.

It is not a weakly prime, because it can be changed into another prime (25885874941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12942937460 + 12942937461.

It is an arithmetic number, because the mean of its divisors is an integer number (12942937461).

Almost surely, 2^25885874921 is an apocalyptic number.

It is an amenable number.

25885874921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25885874921 is an equidigital number, since it uses as much as digits as its factorization.

25885874921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12902400, while the sum is 59.

The spelling of 25885874921 in words is "twenty-five billion, eight hundred eighty-five million, eight hundred seventy-four thousand, nine hundred twenty-one".