25518517279 has 2 divisors, whose sum is σ = 25518517280. Its totient is φ = 25518517278.

The previous prime is 25518517261. The next prime is 25518517307. The reversal of 25518517279 is 97271581552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25518517279 - 2¹³ = 25518509087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25518514279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12759258639 + 12759258640.

It is an arithmetic number, because the mean of its divisors is an integer number (12759258640).

Almost surely, 2^25518517279 is an apocalyptic number.

25518517279 is a deficient number, since it is larger than the sum of its proper divisors (1).

25518517279 is an equidigital number, since it uses as much as digits as its factorization.

25518517279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764000, while the sum is 52.

The spelling of 25518517279 in words is "twenty-five billion, five hundred eighteen million, five hundred seventeen thousand, two hundred seventy-nine".