25690686851 has 2 divisors, whose sum is σ = 25690686852. Its totient is φ = 25690686850.

The previous prime is 25690686821. The next prime is 25690686869. The reversal of 25690686851 is 15868609652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25690686851 - 2³⁰ = 24616945027 is a prime.

It is a super-2 number, since 2×25690686851² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25690686811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845343425 + 12845343426.

It is an arithmetic number, because the mean of its divisors is an integer number (12845343426).

Almost surely, 2^25690686851 is an apocalyptic number.

25690686851 is a deficient number, since it is larger than the sum of its proper divisors (1).

25690686851 is an equidigital number, since it uses as much as digits as its factorization.

25690686851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 56.

The spelling of 25690686851 in words is "twenty-five billion, six hundred ninety million, six hundred eighty-six thousand, eight hundred fifty-one".