2640666003 has 4 divisors (see below), whose sum is σ = 3520888008. Its totient is φ = 1760444000.

The previous prime is 2640665969. The next prime is 2640666013. The reversal of 2640666003 is 3006660462.

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

It is a cyclic number.

It is not a de Polignac number, because 2640666003 - 2¹⁸ = 2640403859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2640666013) 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, 440110998 + ... + 440111003.

It is an arithmetic number, because the mean of its divisors is an integer number (880222002).

Almost surely, 2^2640666003 is an apocalyptic number.

2640666003 is a deficient number, since it is larger than the sum of its proper divisors (880222005).

2640666003 is an equidigital number, since it uses as much as digits as its factorization.

2640666003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880222004.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 2640666003 is about 51387.4109388671. The cubic root of 2640666003 is about 1382.2008575082.

The spelling of 2640666003 in words is "two billion, six hundred forty million, six hundred sixty-six thousand, three".