25521284427680 has 48 divisors (see below), whose sum is σ = 60296010231240. Its totient is φ = 10208179249152.

The previous prime is 25521284427649. The next prime is 25521284427701. The reversal of 25521284427680 is 8672448212552.

It can be written as a sum of positive squares in 4 ways, for example, as 21742039562896 + 3779244864784 = 4662836^2 + 1944028^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2313416 + ... + 7509624.

Almost surely, 2^{25521284427680} is an apocalyptic number.

25521284427680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25521284427680 is an abundant number, since it is smaller than the sum of its proper divisors (34774725803560).

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

25521284427680 is a wasteful number, since it uses less digits than its factorization.

25521284427680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226921 (or 5226913 counting only the distinct ones).

The product of its (nonzero) digits is 17203200, while the sum is 56.

The spelling of 25521284427680 in words is "twenty-five trillion, five hundred twenty-one billion, two hundred eighty-four million, four hundred twenty-seven thousand, six hundred eighty".