2564781785 has 16 divisors (see below), whose sum is σ = 3241425600. Its totient is φ = 1942814016.

The previous prime is 2564781767. The next prime is 2564781811. The reversal of 2564781785 is 5871874652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2564781785 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, 209411 + ... + 221319.

It is an arithmetic number, because the mean of its divisors is an integer number (202589100).

Almost surely, 2^2564781785 is an apocalyptic number.

It is an amenable number.

2564781785 is a deficient number, since it is larger than the sum of its proper divisors (676643815).

2564781785 is a wasteful number, since it uses less digits than its factorization.

2564781785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14200.

The product of its digits is 3763200, while the sum is 53.

The square root of 2564781785 is about 50643.6746790752. The cubic root of 2564781785 is about 1368.8319710435.

The spelling of 2564781785 in words is "two billion, five hundred sixty-four million, seven hundred eighty-one thousand, seven hundred eighty-five".