25995405979 has 2 divisors, whose sum is σ = 25995405980. Its totient is φ = 25995405978.

The previous prime is 25995405949. The next prime is 25995405991. The reversal of 25995405979 is 97950459952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25995405979 - 2²¹ = 25993308827 is a prime.

It is a super-2 number, since 2×25995405979² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25995405979.

It is not a weakly prime, because it can be changed into another prime (25995405949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12997702989 + 12997702990.

It is an arithmetic number, because the mean of its divisors is an integer number (12997702990).

Almost surely, 2^25995405979 is an apocalyptic number.

25995405979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25995405979 is an equidigital number, since it uses as much as digits as its factorization.

25995405979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927000, while the sum is 64.

The spelling of 25995405979 in words is "twenty-five billion, nine hundred ninety-five million, four hundred five thousand, nine hundred seventy-nine".