25400279531831 has 2 divisors, whose sum is σ = 25400279531832. Its totient is φ = 25400279531830.

The previous prime is 25400279531791. The next prime is 25400279531833. The reversal of 25400279531831 is 13813597200452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25400279531831 - 2²⁶ = 25400212422967 is a prime.

It is a super-2 number, since 2×25400279531831² (a number of 28 digits) contains 22 as substring.

Together with 25400279531833, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25400279531831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25400279531833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12700139765915 + 12700139765916.

It is an arithmetic number, because the mean of its divisors is an integer number (12700139765916).

Almost surely, 2^{25400279531831} is an apocalyptic number.

25400279531831 is a deficient number, since it is larger than the sum of its proper divisors (1).

25400279531831 is an equidigital number, since it uses as much as digits as its factorization.

25400279531831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 25400279531831 in words is "twenty-five trillion, four hundred billion, two hundred seventy-nine million, five hundred thirty-one thousand, eight hundred thirty-one".