25374920521 has 2 divisors, whose sum is σ = 25374920522. Its totient is φ = 25374920520.

The previous prime is 25374920507. The next prime is 25374920573. The reversal of 25374920521 is 12502947352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19102280521 + 6272640000 = 138211^2 + 79200^2 .

It is a cyclic number.

It is not a de Polignac number, because 25374920521 - 2²⁹ = 24838049609 is a prime.

It is a super-2 number, since 2×25374920521² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25374920581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12687460260 + 12687460261.

It is an arithmetic number, because the mean of its divisors is an integer number (12687460261).

Almost surely, 2^25374920521 is an apocalyptic number.

It is an amenable number.

25374920521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25374920521 is an equidigital number, since it uses as much as digits as its factorization.

25374920521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 25374920521 in words is "twenty-five billion, three hundred seventy-four million, nine hundred twenty thousand, five hundred twenty-one".