25564454647 has 4 divisors (see below), whose sum is σ = 26909952280. Its totient is φ = 24218957016.

The previous prime is 25564454639. The next prime is 25564454677. The reversal of 25564454647 is 74645446552.

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

It is a cyclic number.

It is not a de Polignac number, because 25564454647 - 2³ = 25564454639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25564454594 and 25564454603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25564454677) 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 3 ways as a sum of consecutive naturals, for example, 672748788 + ... + 672748825.

It is an arithmetic number, because the mean of its divisors is an integer number (6727488070).

Almost surely, 2^25564454647 is an apocalyptic number.

25564454647 is a deficient number, since it is larger than the sum of its proper divisors (1345497633).

25564454647 is a wasteful number, since it uses less digits than its factorization.

25564454647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345497632.

The product of its digits is 16128000, while the sum is 52.

The spelling of 25564454647 in words is "twenty-five billion, five hundred sixty-four million, four hundred fifty-four thousand, six hundred forty-seven".