2644777985 has 16 divisors (see below), whose sum is σ = 3214766016. Its totient is φ = 2088512448.

The previous prime is 2644777969. The next prime is 2644777987. The reversal of 2644777985 is 5897774462.

It is a cyclic number.

It is not a de Polignac number, because 2644777985 - 2⁴ = 2644777969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2644777987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 673247 + ... + 677163.

It is an arithmetic number, because the mean of its divisors is an integer number (200922876).

Almost surely, 2^2644777985 is an apocalyptic number.

It is an amenable number.

2644777985 is a deficient number, since it is larger than the sum of its proper divisors (569988031).

2644777985 is a wasteful number, since it uses less digits than its factorization.

2644777985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632.

The product of its digits is 23708160, while the sum is 59.

The square root of 2644777985 is about 51427.4049996692. The cubic root of 2644777985 is about 1382.9179288172.

The spelling of 2644777985 in words is "two billion, six hundred forty-four million, seven hundred seventy-seven thousand, nine hundred eighty-five".