25617666001 has 4 divisors (see below), whose sum is σ = 25640766900. Its totient is φ = 25594565104.

The previous prime is 25617665977. The next prime is 25617666007. The reversal of 25617666001 is 10066671652.

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 10531685376 + 15085980625 = 102624^2 + 122825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25617666001 is a prime.

It is a super-2 number, since 2×25617666001² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25617666007) 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, 11548786 + ... + 11551003.

It is an arithmetic number, because the mean of its divisors is an integer number (6410191725).

Almost surely, 2^25617666001 is an apocalyptic number.

It is an amenable number.

25617666001 is a deficient number, since it is larger than the sum of its proper divisors (23100899).

25617666001 is a wasteful number, since it uses less digits than its factorization.

25617666001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23100898.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 25617666001 in words is "twenty-five billion, six hundred seventeen million, six hundred sixty-six thousand, one".