2557965209 has 8 divisors (see below), whose sum is σ = 2654321472. Its totient is φ = 2463284880.

The previous prime is 2557965203. The next prime is 2557965211. The reversal of 2557965209 is 9025697552.

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 2557965209 - 2²⁰ = 2556916633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2557965203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415874 + ... + 421979.

It is an arithmetic number, because the mean of its divisors is an integer number (331790184).

Almost surely, 2^2557965209 is an apocalyptic number.

It is an amenable number.

2557965209 is a deficient number, since it is larger than the sum of its proper divisors (96356263).

2557965209 is an equidigital number, since it uses as much as digits as its factorization.

2557965209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837967.

The product of its (nonzero) digits is 1701000, while the sum is 50.

The square root of 2557965209 is about 50576.3305213022. The cubic root of 2557965209 is about 1367.6182192225.

The spelling of 2557965209 in words is "two billion, five hundred fifty-seven million, nine hundred sixty-five thousand, two hundred nine".