25691263907 has 2 divisors, whose sum is σ = 25691263908. Its totient is φ = 25691263906.

The previous prime is 25691263903. The next prime is 25691263987. The reversal of 25691263907 is 70936219652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25691263907 - 2² = 25691263903 is a prime.

It is a super-2 number, since 2×25691263907² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25691263903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845631953 + 12845631954.

It is an arithmetic number, because the mean of its divisors is an integer number (12845631954).

Almost surely, 2^25691263907 is an apocalyptic number.

25691263907 is a deficient number, since it is larger than the sum of its proper divisors (1).

25691263907 is an equidigital number, since it uses as much as digits as its factorization.

25691263907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 25691263907 in words is "twenty-five billion, six hundred ninety-one million, two hundred sixty-three thousand, nine hundred seven".