25666243564 has 24 divisors (see below), whose sum is σ = 48559236768. Its totient is φ = 11799859200.

The previous prime is 25666243517. The next prime is 25666243567. The reversal of 25666243564 is 46534266652.

It is not an unprimeable number, because it can be changed into a prime (25666243567) by changing a digit.

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, 946912 + ... + 973639.

It is an arithmetic number, because the mean of its divisors is an integer number (2023301532).

Almost surely, 2^25666243564 is an apocalyptic number.

It is an amenable number.

25666243564 is a deficient number, since it is larger than the sum of its proper divisors (22892993204).

25666243564 is a wasteful number, since it uses less digits than its factorization.

25666243564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920825 (or 1920823 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 49.

The spelling of 25666243564 in words is "twenty-five billion, six hundred sixty-six million, two hundred forty-three thousand, five hundred sixty-four".