2557953665 has 16 divisors (see below), whose sum is σ = 3088108800. Its totient is φ = 2034020352.

The previous prime is 2557953659. The next prime is 2557953683. The reversal of 2557953665 is 5663597552.

It is a cyclic number.

It is not a de Polignac number, because 2557953665 - 2⁴ = 2557953649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766721 + ... + 770049.

It is an arithmetic number, because the mean of its divisors is an integer number (193006800).

Almost surely, 2^2557953665 is an apocalyptic number.

It is an amenable number.

2557953665 is a deficient number, since it is larger than the sum of its proper divisors (530155135).

2557953665 is a wasteful number, since it uses less digits than its factorization.

2557953665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216.

The product of its digits is 8505000, while the sum is 53.

The square root of 2557953665 is about 50576.2163966424. The cubic root of 2557953665 is about 1367.6161618830.

The spelling of 2557953665 in words is "two billion, five hundred fifty-seven million, nine hundred fifty-three thousand, six hundred sixty-five".