2640002045 has 4 divisors (see below), whose sum is σ = 3168002460. Its totient is φ = 2112001632.

The previous prime is 2640002041. The next prime is 2640002069. The reversal of 2640002045 is 5402000462.

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 430438009 + 2209564036 = 20747^2 + 47006^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640002045 - 2² = 2640002041 is a prime.

It is a super-2 number, since 2×2640002045² = 13939221595208364050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2640002045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640002041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264000200 + ... + 264000209.

It is an arithmetic number, because the mean of its divisors is an integer number (792000615).

Almost surely, 2^2640002045 is an apocalyptic number.

It is an amenable number.

2640002045 is a deficient number, since it is larger than the sum of its proper divisors (528000415).

2640002045 is an equidigital number, since it uses as much as digits as its factorization.

2640002045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528000414.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2640002045 is about 51380.9502150359. The cubic root of 2640002045 is about 1382.0850028662.

The spelling of 2640002045 in words is "two billion, six hundred forty million, two thousand, forty-five".