25364768657 has 2 divisors, whose sum is σ = 25364768658. Its totient is φ = 25364768656.

The previous prime is 25364768521. The next prime is 25364768677. The reversal of 25364768657 is 75686746352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22405299856 + 2959468801 = 149684^2 + 54401^2 .

It is a cyclic number.

It is not a de Polignac number, because 25364768657 - 2¹² = 25364764561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25364768596 and 25364768605.

It is not a weakly prime, because it can be changed into another prime (25364768677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12682384328 + 12682384329.

It is an arithmetic number, because the mean of its divisors is an integer number (12682384329).

Almost surely, 2^25364768657 is an apocalyptic number.

It is an amenable number.

25364768657 is a deficient number, since it is larger than the sum of its proper divisors (1).

25364768657 is an equidigital number, since it uses as much as digits as its factorization.

25364768657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50803200, while the sum is 59.

The spelling of 25364768657 in words is "twenty-five billion, three hundred sixty-four million, seven hundred sixty-eight thousand, six hundred fifty-seven".