25720650851840 has 80 divisors (see below), whose sum is σ = 70479176356512. Its totient is φ = 8818508857344.

The previous prime is 25720650851827. The next prime is 25720650851867. The reversal of 25720650851840 is 4815805602752.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717634169 + ... + 717670008.

Almost surely, 2^{25720650851840} is an apocalyptic number.

25720650851840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25720650851840 is an abundant number, since it is smaller than the sum of its proper divisors (44758525504672).

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

25720650851840 is an equidigital number, since it uses as much as digits as its factorization.

25720650851840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435304207 (or 1435304191 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 53.

The spelling of 25720650851840 in words is "twenty-five trillion, seven hundred twenty billion, six hundred fifty million, eight hundred fifty-one thousand, eight hundred forty".