2864644665 has 32 divisors (see below), whose sum is σ = 4622977152. Its totient is φ = 1514688000.

The previous prime is 2864644661. The next prime is 2864644669. The reversal of 2864644665 is 5664464682.

2864644665 = T₁₁₂₆₁ + T₁₁₂₆₂ + ... + T₁₁₃₀₅.

2864644665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2864644661) and next prime (2864644669).

It is not a de Polignac number, because 2864644665 - 2² = 2864644661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2864644661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 887755 + ... + 890975.

It is an arithmetic number, because the mean of its divisors is an integer number (144468036).

Almost surely, 2^2864644665 is an apocalyptic number.

It is an amenable number.

2864644665 is a deficient number, since it is larger than the sum of its proper divisors (1758332487).

2864644665 is a wasteful number, since it uses less digits than its factorization.

2864644665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721.

The product of its digits is 6635520, while the sum is 51.

The square root of 2864644665 is about 53522.3753676908. The cubic root of 2864644665 is about 1420.2242363928.

The spelling of 2864644665 in words is "two billion, eight hundred sixty-four million, six hundred forty-four thousand, six hundred sixty-five".