25666667513 has 2 divisors, whose sum is σ = 25666667514. Its totient is φ = 25666667512.

The previous prime is 25666667483. The next prime is 25666667519. The reversal of 25666667513 is 31576666652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24922305424 + 744362089 = 157868^2 + 27283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25666667513 is a prime.

It is not a weakly prime, because it can be changed into another prime (25666667519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833333756 + 12833333757.

It is an arithmetic number, because the mean of its divisors is an integer number (12833333757).

Almost surely, 2^25666667513 is an apocalyptic number.

It is an amenable number.

25666667513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666667513 is an equidigital number, since it uses as much as digits as its factorization.

25666667513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 53.

The spelling of 25666667513 in words is "twenty-five billion, six hundred sixty-six million, six hundred sixty-seven thousand, five hundred thirteen".