25951721879 has 2 divisors, whose sum is σ = 25951721880. Its totient is φ = 25951721878.

The previous prime is 25951721849. The next prime is 25951721897. The reversal of 25951721879 is 97812715952.

Together with next prime (25951721897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25951721879 - 2⁸ = 25951721623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25951721849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12975860939 + 12975860940.

It is an arithmetic number, because the mean of its divisors is an integer number (12975860940).

Almost surely, 2^25951721879 is an apocalyptic number.

25951721879 is a deficient number, since it is larger than the sum of its proper divisors (1).

25951721879 is an equidigital number, since it uses as much as digits as its factorization.

25951721879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 56.

The spelling of 25951721879 in words is "twenty-five billion, nine hundred fifty-one million, seven hundred twenty-one thousand, eight hundred seventy-nine".