25572097817 has 4 divisors (see below), whose sum is σ = 29225254656. Its totient is φ = 21918940980.

The previous prime is 25572097801. The next prime is 25572097861. The reversal of 25572097817 is 71879027552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25572097817 - 2⁴ = 25572097801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25572097217) 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, 1826578409 + ... + 1826578422.

It is an arithmetic number, because the mean of its divisors is an integer number (7306313664).

Almost surely, 2^25572097817 is an apocalyptic number.

It is an amenable number.

25572097817 is a deficient number, since it is larger than the sum of its proper divisors (3653156839).

25572097817 is an equidigital number, since it uses as much as digits as its factorization.

25572097817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653156838.

The product of its (nonzero) digits is 2469600, while the sum is 53.

The spelling of 25572097817 in words is "twenty-five billion, five hundred seventy-two million, ninety-seven thousand, eight hundred seventeen".