25665850465 has 16 divisors (see below), whose sum is σ = 32903910720. Its totient is φ = 19161679680.

The previous prime is 25665850459. The next prime is 25665850493. The reversal of 25665850465 is 56405856652.

It is a de Polignac number, because none of the positive numbers 2^k-25665850465 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2009806 + ... + 2022535.

It is an arithmetic number, because the mean of its divisors is an integer number (2056494420).

Almost surely, 2^25665850465 is an apocalyptic number.

It is an amenable number.

25665850465 is a deficient number, since it is larger than the sum of its proper divisors (7238060255).

25665850465 is a wasteful number, since it uses less digits than its factorization.

25665850465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032432.

The product of its (nonzero) digits is 8640000, while the sum is 52.

The spelling of 25665850465 in words is "twenty-five billion, six hundred sixty-five million, eight hundred fifty thousand, four hundred sixty-five".