25517893247 has 16 divisors (see below), whose sum is σ = 33488966400. Its totient is φ = 18837541440.

The previous prime is 25517893243. The next prime is 25517893249. The reversal of 25517893247 is 74239871552.

It is a cyclic number.

It is not a de Polignac number, because 25517893247 - 2² = 25517893243 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25517893243) 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, 8719622 + ... + 8722547.

It is an arithmetic number, because the mean of its divisors is an integer number (2093060400).

Almost surely, 2^25517893247 is an apocalyptic number.

25517893247 is a deficient number, since it is larger than the sum of its proper divisors (7971073153).

25517893247 is a wasteful number, since it uses less digits than its factorization.

25517893247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17442206.

The product of its digits is 4233600, while the sum is 53.

The spelling of 25517893247 in words is "twenty-five billion, five hundred seventeen million, eight hundred ninety-three thousand, two hundred forty-seven".