25728724979 has 2 divisors, whose sum is σ = 25728724980. Its totient is φ = 25728724978.

The previous prime is 25728724969. The next prime is 25728724993. The reversal of 25728724979 is 97942782752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25728724979 is a prime.

It is not a weakly prime, because it can be changed into another prime (25728724949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12864362489 + 12864362490.

It is an arithmetic number, because the mean of its divisors is an integer number (12864362490).

Almost surely, 2^25728724979 is an apocalyptic number.

25728724979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25728724979 is an equidigital number, since it uses as much as digits as its factorization.

25728724979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35562240, while the sum is 62.

The spelling of 25728724979 in words is "twenty-five billion, seven hundred twenty-eight million, seven hundred twenty-four thousand, nine hundred seventy-nine".