25315321771 has 2 divisors, whose sum is σ = 25315321772. Its totient is φ = 25315321770.

The previous prime is 25315321747. The next prime is 25315321777. The reversal of 25315321771 is 17712351352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25315321771 - 2⁵ = 25315321739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25315321771.

It is not a weakly prime, because it can be changed into another prime (25315321777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12657660885 + 12657660886.

It is an arithmetic number, because the mean of its divisors is an integer number (12657660886).

Almost surely, 2^25315321771 is an apocalyptic number.

25315321771 is a deficient number, since it is larger than the sum of its proper divisors (1).

25315321771 is an equidigital number, since it uses as much as digits as its factorization.

25315321771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 37.

The spelling of 25315321771 in words is "twenty-five billion, three hundred fifteen million, three hundred twenty-one thousand, seven hundred seventy-one".