2640773123 has 4 divisors (see below), whose sum is σ = 2641060008. Its totient is φ = 2640486240.

The previous prime is 2640773119. The next prime is 2640773173. The reversal of 2640773123 is 3213770462.

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 2640773123 - 2² = 2640773119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640773173) 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, 129161 + ... + 148202.

It is an arithmetic number, because the mean of its divisors is an integer number (660265002).

Almost surely, 2^2640773123 is an apocalyptic number.

2640773123 is a deficient number, since it is larger than the sum of its proper divisors (286885).

2640773123 is an equidigital number, since it uses as much as digits as its factorization.

2640773123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286884.

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 2640773123 is about 51388.4532069219. The cubic root of 2640773123 is about 1382.2195471562.

The spelling of 2640773123 in words is "two billion, six hundred forty million, seven hundred seventy-three thousand, one hundred twenty-three".