25305507797 has 2 divisors, whose sum is σ = 25305507798. Its totient is φ = 25305507796.

The previous prime is 25305507781. The next prime is 25305507817. The reversal of 25305507797 is 79770550352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23842139281 + 1463368516 = 154409^2 + 38254^2 .

It is a cyclic number.

It is not a de Polignac number, because 25305507797 - 2⁴ = 25305507781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25305507707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12652753898 + 12652753899.

It is an arithmetic number, because the mean of its divisors is an integer number (12652753899).

Almost surely, 2^25305507797 is an apocalyptic number.

It is an amenable number.

25305507797 is a deficient number, since it is larger than the sum of its proper divisors (1).

25305507797 is an equidigital number, since it uses as much as digits as its factorization.

25305507797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2315250, while the sum is 50.

The spelling of 25305507797 in words is "twenty-five billion, three hundred five million, five hundred seven thousand, seven hundred ninety-seven".