25364768521 has 2 divisors, whose sum is σ = 25364768522. Its totient is φ = 25364768520.

The previous prime is 25364768489. The next prime is 25364768657. The reversal of 25364768521 is 12586746352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24900840000 + 463928521 = 157800^2 + 21539^2 .

It is a cyclic number.

It is not a de Polignac number, because 25364768521 - 2⁵ = 25364768489 is a prime.

It is not a weakly prime, because it can be changed into another prime (25364738521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12682384260 + 12682384261.

It is an arithmetic number, because the mean of its divisors is an integer number (12682384261).

Almost surely, 2^25364768521 is an apocalyptic number.

It is an amenable number.

25364768521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25364768521 is an equidigital number, since it uses as much as digits as its factorization.

25364768521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 49.

The spelling of 25364768521 in words is "twenty-five billion, three hundred sixty-four million, seven hundred sixty-eight thousand, five hundred twenty-one".