25253456661 has 12 divisors (see below), whose sum is σ = 36587422560. Its totient is φ = 16784772840.

The previous prime is 25253456659. The next prime is 25253456663. The reversal of 25253456661 is 16665435252.

It is an interprime number because it is at equal distance from previous prime (25253456659) and next prime (25253456663).

It is not a de Polignac number, because 25253456661 - 2¹ = 25253456659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25253456663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4235601 + ... + 4241558.

It is an arithmetic number, because the mean of its divisors is an integer number (3048951880).

Almost surely, 2^25253456661 is an apocalyptic number.

It is an amenable number.

25253456661 is a deficient number, since it is larger than the sum of its proper divisors (11333965899).

25253456661 is a wasteful number, since it uses less digits than its factorization.

25253456661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8477496 (or 8477493 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The spelling of 25253456661 in words is "twenty-five billion, two hundred fifty-three million, four hundred fifty-six thousand, six hundred sixty-one".