25540566606 has 48 divisors (see below), whose sum is σ = 55665664704. Its totient is φ = 8463163392.

The previous prime is 25540566563. The next prime is 25540566613. The reversal of 25540566606 is 60666504552.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9229035 + ... + 9231801.

It is an arithmetic number, because the mean of its divisors is an integer number (1159701348).

Almost surely, 2^25540566606 is an apocalyptic number.

25540566606 is an abundant number, since it is smaller than the sum of its proper divisors (30125098098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25540566606 is a wasteful number, since it uses less digits than its factorization.

25540566606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5625 (or 5622 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The spelling of 25540566606 in words is "twenty-five billion, five hundred forty million, five hundred sixty-six thousand, six hundred six".