25214524561 has 4 divisors (see below), whose sum is σ = 25217427172. Its totient is φ = 25211621952.

The previous prime is 25214524537. The next prime is 25214524567. The reversal of 25214524561 is 16542541252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21498890625 + 3715633936 = 146625^2 + 60956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25214524561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25214524561.

It is not an unprimeable number, because it can be changed into a prime (25214524567) 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, 1438236 + ... + 1455661.

It is an arithmetic number, because the mean of its divisors is an integer number (6304356793).

Almost surely, 2^25214524561 is an apocalyptic number.

It is an amenable number.

25214524561 is a deficient number, since it is larger than the sum of its proper divisors (2902611).

25214524561 is an equidigital number, since it uses as much as digits as its factorization.

25214524561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902610.

The product of its digits is 96000, while the sum is 37.

The spelling of 25214524561 in words is "twenty-five billion, two hundred fourteen million, five hundred twenty-four thousand, five hundred sixty-one".