25566730979 has 2 divisors, whose sum is σ = 25566730980. Its totient is φ = 25566730978.

The previous prime is 25566730963. The next prime is 25566731033. The reversal of 25566730979 is 97903766552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25566730979 - 2⁴ = 25566730963 is a prime.

It is not a weakly prime, because it can be changed into another prime (25566730879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12783365489 + 12783365490.

It is an arithmetic number, because the mean of its divisors is an integer number (12783365490).

Almost surely, 2^25566730979 is an apocalyptic number.

25566730979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25566730979 is an equidigital number, since it uses as much as digits as its factorization.

25566730979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21432600, while the sum is 59.

The spelling of 25566730979 in words is "twenty-five billion, five hundred sixty-six million, seven hundred thirty thousand, nine hundred seventy-nine".