25264342561 has 2 divisors, whose sum is σ = 25264342562. Its totient is φ = 25264342560.

The previous prime is 25264342547. The next prime is 25264342633. The reversal of 25264342561 is 16524346252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13283945536 + 11980397025 = 115256^2 + 109455^2 .

It is a cyclic number.

It is not a de Polignac number, because 25264342561 - 2⁵ = 25264342529 is a prime.

It is not a weakly prime, because it can be changed into another prime (25264342511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12632171280 + 12632171281.

It is an arithmetic number, because the mean of its divisors is an integer number (12632171281).

Almost surely, 2^25264342561 is an apocalyptic number.

It is an amenable number.

25264342561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25264342561 is an equidigital number, since it uses as much as digits as its factorization.

25264342561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 40.

The spelling of 25264342561 in words is "twenty-five billion, two hundred sixty-four million, three hundred forty-two thousand, five hundred sixty-one".