25664644653457 has 4 divisors (see below), whose sum is σ = 25664693058100. Its totient is φ = 25664596248816.

The previous prime is 25664644653391. The next prime is 25664644653491. The reversal of 25664644653457 is 75435644646652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24845997899776 + 818646753681 = 4984576^2 + 904791^2 .

It is a cyclic number.

It is not a de Polignac number, because 25664644653457 - 2²³ = 25664636264849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25664644653392 and 25664644653401.

It is not an unprimeable number, because it can be changed into a prime (25664644653497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23398098 + ... + 24470395.

It is an arithmetic number, because the mean of its divisors is an integer number (6416173264525).

Almost surely, 2^{25664644653457} is an apocalyptic number.

It is an amenable number.

25664644653457 is a deficient number, since it is larger than the sum of its proper divisors (48404643).

25664644653457 is an equidigital number, since it uses as much as digits as its factorization.

25664644653457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48404642.

The product of its digits is 1741824000, while the sum is 67.

The spelling of 25664644653457 in words is "twenty-five trillion, six hundred sixty-four billion, six hundred forty-four million, six hundred fifty-three thousand, four hundred fifty-seven".