25461812997 has 16 divisors (see below), whose sum is σ = 37755950080. Its totient is φ = 16958906496.

The previous prime is 25461812941. The next prime is 25461813001. The reversal of 25461812997 is 79921816452.

It is a happy number.

25461812997 is a `hidden beast` number, since 2 + 5 + 4 + 618 + 12 + 9 + 9 + 7 = 666.

It is not a de Polignac number, because 25461812997 - 2³² = 21166845701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25461862997) 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, 404428 + ... + 463125.

It is an arithmetic number, because the mean of its divisors is an integer number (2359746880).

Almost surely, 2^25461812997 is an apocalyptic number.

25461812997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25461812997 is a deficient number, since it is larger than the sum of its proper divisors (12294137083).

25461812997 is a wasteful number, since it uses less digits than its factorization.

25461812997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868649 (or 868643 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 25461812997 in words is "twenty-five billion, four hundred sixty-one million, eight hundred twelve thousand, nine hundred ninety-seven".