25665621363 has 96 divisors (see below), whose sum is σ = 42664527360. Its totient is φ = 15345158400.

The previous prime is 25665621349. The next prime is 25665621419. The reversal of 25665621363 is 36312656652.

25665621363 is a `hidden beast` number, since 2 + 56 + 6 + 562 + 1 + 36 + 3 = 666.

It is not a de Polignac number, because 25665621363 - 2⁴ = 25665621347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25665621313) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10724095 + ... + 10726487.

It is an arithmetic number, because the mean of its divisors is an integer number (444422160).

Almost surely, 2^25665621363 is an apocalyptic number.

25665621363 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

25665621363 is a deficient number, since it is larger than the sum of its proper divisors (16998905997).

25665621363 is a wasteful number, since it uses less digits than its factorization.

25665621363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551 (or 2539 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

The spelling of 25665621363 in words is "twenty-five billion, six hundred sixty-five million, six hundred twenty-one thousand, three hundred sixty-three".