25665242553 has 16 divisors (see below), whose sum is σ = 39675738240. Its totient is φ = 16366241232.

The previous prime is 25665242539. The next prime is 25665242563. The reversal of 25665242553 is 35524256652.

25665242553 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 52 + 42 + 553 = 666.

It is not a de Polignac number, because 25665242553 - 2⁹ = 25665242041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25665242499 and 25665242508.

It is not an unprimeable number, because it can be changed into a prime (25665242563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20663826 + ... + 20665067.

It is an arithmetic number, because the mean of its divisors is an integer number (2479733640).

Almost surely, 2^25665242553 is an apocalyptic number.

25665242553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

25665242553 is a deficient number, since it is larger than the sum of its proper divisors (14010495687).

25665242553 is a wasteful number, since it uses less digits than its factorization.

25665242553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41328925 (or 41328919 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 45.

The spelling of 25665242553 in words is "twenty-five billion, six hundred sixty-five million, two hundred forty-two thousand, five hundred fifty-three".