25566122649 has 16 divisors (see below), whose sum is σ = 34723757952. Its totient is φ = 16729214208.

The previous prime is 25566122641. The next prime is 25566122671. The reversal of 25566122649 is 94622166552.

It is not a de Polignac number, because 25566122649 - 2³ = 25566122641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25566122598 and 25566122607.

It is not an unprimeable number, because it can be changed into a prime (25566122641) 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 15 ways as a sum of consecutive naturals, for example, 331182 + ... + 401015.

It is an arithmetic number, because the mean of its divisors is an integer number (2170234872).

Almost surely, 2^25566122649 is an apocalyptic number.

It is an amenable number.

25566122649 is a deficient number, since it is larger than the sum of its proper divisors (9157635303).

25566122649 is a wasteful number, since it uses less digits than its factorization.

25566122649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732416.

The product of its digits is 1555200, while the sum is 48.

The spelling of 25566122649 in words is "twenty-five billion, five hundred sixty-six million, one hundred twenty-two thousand, six hundred forty-nine".