25816560747 has 4 divisors (see below), whose sum is σ = 34422081000. Its totient is φ = 17211040496.

The previous prime is 25816560709. The next prime is 25816560787. The reversal of 25816560747 is 74706561852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25816560747 - 2⁶ = 25816560683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25816560747.

It is not an unprimeable number, because it can be changed into a prime (25816560787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4302760122 + ... + 4302760127.

It is an arithmetic number, because the mean of its divisors is an integer number (8605520250).

Almost surely, 2^25816560747 is an apocalyptic number.

25816560747 is a deficient number, since it is larger than the sum of its proper divisors (8605520253).

25816560747 is an equidigital number, since it uses as much as digits as its factorization.

25816560747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8605520252.

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 25816560747 in words is "twenty-five billion, eight hundred sixteen million, five hundred sixty thousand, seven hundred forty-seven".