2557405765 has 8 divisors (see below), whose sum is σ = 3202316928. Its totient is φ = 1956971280.

The previous prime is 2557405733. The next prime is 2557405777. The reversal of 2557405765 is 5675047552.

2557405765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2557405765 - 2⁵ = 2557405733 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 11119041 + ... + 11119270.

It is an arithmetic number, because the mean of its divisors is an integer number (400289616).

Almost surely, 2^2557405765 is an apocalyptic number.

It is an amenable number.

2557405765 is a deficient number, since it is larger than the sum of its proper divisors (644911163).

2557405765 is a wasteful number, since it uses less digits than its factorization.

2557405765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22238339.

The product of its (nonzero) digits is 1470000, while the sum is 46.

The square root of 2557405765 is about 50570.7995289772. The cubic root of 2557405765 is about 1367.5185095536.

The spelling of 2557405765 in words is "two billion, five hundred fifty-seven million, four hundred five thousand, seven hundred sixty-five".