2556441665 has 8 divisors (see below), whose sum is σ = 3069931200. Its totient is φ = 2043685872.

The previous prime is 2556441631. The next prime is 2556441683. The reversal of 2556441665 is 5661446552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2556441665 - 2²⁰ = 2555393089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175739 + ... + 189728.

It is an arithmetic number, because the mean of its divisors is an integer number (383741400).

Almost surely, 2^2556441665 is an apocalyptic number.

It is an amenable number.

2556441665 is a deficient number, since it is larger than the sum of its proper divisors (513489535).

2556441665 is a wasteful number, since it uses less digits than its factorization.

2556441665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366871.

The product of its digits is 864000, while the sum is 44.

The square root of 2556441665 is about 50561.2664497241. The cubic root of 2556441665 is about 1367.3466439438.

The spelling of 2556441665 in words is "two billion, five hundred fifty-six million, four hundred forty-one thousand, six hundred sixty-five".