2640183977 has 4 divisors (see below), whose sum is σ = 2679589776. Its totient is φ = 2600778180.

The previous prime is 2640183947. The next prime is 2640183989. The reversal of 2640183977 is 7793810462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640183977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640183947) 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, 19702799 + ... + 19702932.

It is an arithmetic number, because the mean of its divisors is an integer number (669897444).

Almost surely, 2^2640183977 is an apocalyptic number.

It is an amenable number.

2640183977 is a deficient number, since it is larger than the sum of its proper divisors (39405799).

2640183977 is an equidigital number, since it uses as much as digits as its factorization.

2640183977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39405798.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 2640183977 is about 51382.7206072236. The cubic root of 2640183977 is about 1382.1167502801.

The spelling of 2640183977 in words is "two billion, six hundred forty million, one hundred eighty-three thousand, nine hundred seventy-seven".