25640936999 has 2 divisors, whose sum is σ = 25640937000. Its totient is φ = 25640936998.

The previous prime is 25640936983. The next prime is 25640937001. The reversal of 25640936999 is 99963904652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25640936999 - 2⁴ = 25640936983 is a prime.

Together with 25640937001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25640936099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820468499 + 12820468500.

It is an arithmetic number, because the mean of its divisors is an integer number (12820468500).

Almost surely, 2^25640936999 is an apocalyptic number.

25640936999 is a deficient number, since it is larger than the sum of its proper divisors (1).

25640936999 is an equidigital number, since it uses as much as digits as its factorization.

25640936999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28343520, while the sum is 62.

The spelling of 25640936999 in words is "twenty-five billion, six hundred forty million, nine hundred thirty-six thousand, nine hundred ninety-nine".