2776640865 has 16 divisors (see below), whose sum is σ = 4459147200. Its totient is φ = 1475367872.

The previous prime is 2776640861. The next prime is 2776640869. The reversal of 2776640865 is 5680466772.

It is an interprime number because it is at equal distance from previous prime (2776640861) and next prime (2776640869).

It is a cyclic number.

It is not a de Polignac number, because 2776640865 - 2² = 2776640861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2776640861) 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, 340035 + ... + 348104.

It is an arithmetic number, because the mean of its divisors is an integer number (278696700).

Almost surely, 2^2776640865 is an apocalyptic number.

It is an amenable number.

2776640865 is a deficient number, since it is larger than the sum of its proper divisors (1682506335).

2776640865 is a wasteful number, since it uses less digits than its factorization.

2776640865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688416.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The square root of 2776640865 is about 52693.8408639947. The cubic root of 2776640865 is about 1405.5293007907.

The spelling of 2776640865 in words is "two billion, seven hundred seventy-six million, six hundred forty thousand, eight hundred sixty-five".