25992544979 has 2 divisors, whose sum is σ = 25992544980. Its totient is φ = 25992544978.

The previous prime is 25992544933. The next prime is 25992545009. The reversal of 25992544979 is 97944529952.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25992544979 is a prime.

It is a super-2 number, since 2×25992544979² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25992544379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12996272489 + 12996272490.

It is an arithmetic number, because the mean of its divisors is an integer number (12996272490).

Almost surely, 2^25992544979 is an apocalyptic number.

25992544979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25992544979 is an equidigital number, since it uses as much as digits as its factorization.

25992544979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73483200, while the sum is 65.

The spelling of 25992544979 in words is "twenty-five billion, nine hundred ninety-two million, five hundred forty-four thousand, nine hundred seventy-nine".