25664644653465 has 128 divisors (see below), whose sum is σ = 45971777617920. Its totient is φ = 12174267340800.

The previous prime is 25664644653391. The next prime is 25664644653491. The reversal of 25664644653465 is 56435644646652.

It is not a de Polignac number, because 25664644653465 - 2⁹ = 25664644652953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25664644653396 and 25664644653405.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 39016084 + ... + 39668426.

It is an arithmetic number, because the mean of its divisors is an integer number (359154512640).

Almost surely, 2^{25664644653465} is an apocalyptic number.

It is an amenable number.

25664644653465 is a deficient number, since it is larger than the sum of its proper divisors (20307132964455).

25664644653465 is a wasteful number, since it uses less digits than its factorization.

25664644653465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652535.

The product of its digits is 1492992000, while the sum is 66.

The spelling of 25664644653465 in words is "twenty-five trillion, six hundred sixty-four billion, six hundred forty-four million, six hundred fifty-three thousand, four hundred sixty-five".