25646162563820 has 48 divisors (see below), whose sum is σ = 53961611084640. Its totient is φ = 10238547162624.

The previous prime is 25646162563783. The next prime is 25646162563823. The reversal of 25646162563820 is 2836526164652.

It is not an unprimeable number, because it can be changed into a prime (25646162563823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20783582 + ... + 21982938.

It is an arithmetic number, because the mean of its divisors is an integer number (1124200230930).

Almost surely, 2^{25646162563820} is an apocalyptic number.

25646162563820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25646162563820 is an abundant number, since it is smaller than the sum of its proper divisors (28315448520820).

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

25646162563820 is a wasteful number, since it uses less digits than its factorization.

25646162563820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201442 (or 1201440 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 56.

The spelling of 25646162563820 in words is "twenty-five trillion, six hundred forty-six billion, one hundred sixty-two million, five hundred sixty-three thousand, eight hundred twenty".