25738979979 has 16 divisors (see below), whose sum is σ = 34786160640. Its totient is φ = 16926948000.

The previous prime is 25738979977. The next prime is 25738979993. The reversal of 25738979979 is 97997983752.

It is not a de Polignac number, because 25738979979 - 2¹ = 25738979977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25738979979.

It is not an unprimeable number, because it can be changed into a prime (25738979977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99147 + ... + 247604.

It is an arithmetic number, because the mean of its divisors is an integer number (2174135040).

Almost surely, 2^25738979979 is an apocalyptic number.

25738979979 is a deficient number, since it is larger than the sum of its proper divisors (9047180661).

25738979979 is a wasteful number, since it uses less digits than its factorization.

25738979979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347090.

The product of its digits is 540101520, while the sum is 75.

The spelling of 25738979979 in words is "twenty-five billion, seven hundred thirty-eight million, nine hundred seventy-nine thousand, nine hundred seventy-nine".