25513250518987 has 16 divisors (see below), whose sum is σ = 31921126278912. Its totient is φ = 19810205975520.

The previous prime is 25513250518979. The next prime is 25513250519027. The reversal of 25513250518987 is 78981505231552.

It is a cyclic number.

It is not a de Polignac number, because 25513250518987 - 2³ = 25513250518979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25513250518907) 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, 585386188 + ... + 585429769.

It is an arithmetic number, because the mean of its divisors is an integer number (1995070392432).

Almost surely, 2^{25513250518987} is an apocalyptic number.

25513250518987 is a deficient number, since it is larger than the sum of its proper divisors (6407875759925).

25513250518987 is a wasteful number, since it uses less digits than its factorization.

25513250518987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170816258.

The product of its (nonzero) digits is 30240000, while the sum is 61.

The spelling of 25513250518987 in words is "twenty-five trillion, five hundred thirteen billion, two hundred fifty million, five hundred eighteen thousand, nine hundred eighty-seven".