25880166601 has 4 divisors (see below), whose sum is σ = 25896333204. Its totient is φ = 25864000000.

The previous prime is 25880166593. The next prime is 25880166623. The reversal of 25880166601 is 10666108852.

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 13572483001 + 12307683600 = 116501^2 + 110940^2 .

It is a cyclic number.

It is not a de Polignac number, because 25880166601 - 2³ = 25880166593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25880163601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8080900 + ... + 8084101.

It is an arithmetic number, because the mean of its divisors is an integer number (6474083301).

Almost surely, 2^25880166601 is an apocalyptic number.

It is an amenable number.

25880166601 is a deficient number, since it is larger than the sum of its proper divisors (16166603).

25880166601 is a wasteful number, since it uses less digits than its factorization.

25880166601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16166602.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 25880166601 in words is "twenty-five billion, eight hundred eighty million, one hundred sixty-six thousand, six hundred one".