2564677985 has 4 divisors (see below), whose sum is σ = 3077613588. Its totient is φ = 2051742384.

The previous prime is 2564677979. The next prime is 2564678029. The reversal of 2564677985 is 5897764652.

2564677985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 893830609 + 1670847376 = 29897^2 + 40876^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564677985 - 2²⁴ = 2547900769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256467794 + ... + 256467803.

It is an arithmetic number, because the mean of its divisors is an integer number (769403397).

Almost surely, 2^2564677985 is an apocalyptic number.

It is an amenable number.

2564677985 is a deficient number, since it is larger than the sum of its proper divisors (512935603).

2564677985 is an equidigital number, since it uses as much as digits as its factorization.

2564677985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512935602.

The product of its digits is 25401600, while the sum is 59.

The square root of 2564677985 is about 50642.6498615544. The cubic root of 2564677985 is about 1368.8135046674.

The spelling of 2564677985 in words is "two billion, five hundred sixty-four million, six hundred seventy-seven thousand, nine hundred eighty-five".