25566056623 has 4 divisors (see below), whose sum is σ = 25566905560. Its totient is φ = 25565207688.

The previous prime is 25566056603. The next prime is 25566056629. The reversal of 25566056623 is 32665066552.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25566056623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25566056629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377568 + ... + 440101.

It is an arithmetic number, because the mean of its divisors is an integer number (6391726390).

Almost surely, 2^25566056623 is an apocalyptic number.

25566056623 is a deficient number, since it is larger than the sum of its proper divisors (848937).

25566056623 is an equidigital number, since it uses as much as digits as its factorization.

25566056623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848936.

The product of its (nonzero) digits is 1944000, while the sum is 46.

The spelling of 25566056623 in words is "twenty-five billion, five hundred sixty-six million, fifty-six thousand, six hundred twenty-three".