25661841207408 has 120 divisors (see below), whose sum is σ = 86905227004128. Its totient is φ = 6900663177216.

The previous prime is 25661841207397. The next prime is 25661841207433. The reversal of 25661841207408 is 80470214816652.

25661841207408 is a `hidden beast` number, since 2 + 5 + 6 + 618 + 4 + 12 + 0 + 7 + 4 + 0 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 748752741 + ... + 748787012.

Almost surely, 2^{25661841207408} is an apocalyptic number.

25661841207408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25661841207408 is an abundant number, since it is smaller than the sum of its proper divisors (61243385796720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25661841207408 is a wasteful number, since it uses less digits than its factorization.

25661841207408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497539791 (or 1497539782 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The spelling of 25661841207408 in words is "twenty-five trillion, six hundred sixty-one billion, eight hundred forty-one million, two hundred seven thousand, four hundred eight".