25436566545 has 64 divisors (see below), whose sum is σ = 44453068800. Its totient is φ = 12344866560.

The previous prime is 25436566469. The next prime is 25436566613. The reversal of 25436566545 is 54566563452.

It is not a de Polignac number, because 25436566545 - 2²⁸ = 25168131089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19702350 + ... + 19703640.

It is an arithmetic number, because the mean of its divisors is an integer number (694579200).

Almost surely, 2^25436566545 is an apocalyptic number.

It is an amenable number.

25436566545 is a deficient number, since it is larger than the sum of its proper divisors (19016502255).

25436566545 is a wasteful number, since it uses less digits than its factorization.

25436566545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670.

The product of its digits is 12960000, while the sum is 51.

The spelling of 25436566545 in words is "twenty-five billion, four hundred thirty-six million, five hundred sixty-six thousand, five hundred forty-five".