25656806801 has 4 divisors (see below), whose sum is σ = 25695740400. Its totient is φ = 25617873204.

The previous prime is 25656806789. The next prime is 25656806863. The reversal of 25656806801 is 10860865652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25656806801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25656806401) 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, 19465811 + ... + 19467128.

It is an arithmetic number, because the mean of its divisors is an integer number (6423935100).

Almost surely, 2^25656806801 is an apocalyptic number.

It is an amenable number.

25656806801 is a deficient number, since it is larger than the sum of its proper divisors (38933599).

25656806801 is an equidigital number, since it uses as much as digits as its factorization.

25656806801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38933598.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 25656806801 in words is "twenty-five billion, six hundred fifty-six million, eight hundred six thousand, eight hundred one".