2640722566 has 4 divisors (see below), whose sum is σ = 3961083852. Its totient is φ = 1320361282.

The previous prime is 2640722563. The next prime is 2640722587. The reversal of 2640722566 is 6652270462.

2640722566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640722563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660180640 + ... + 660180643.

It is an arithmetic number, because the mean of its divisors is an integer number (990270963).

Almost surely, 2^2640722566 is an apocalyptic number.

2640722566 is a deficient number, since it is larger than the sum of its proper divisors (1320361286).

2640722566 is a wasteful number, since it uses less digits than its factorization.

2640722566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320361285.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 2640722566 is about 51387.9612944511. The cubic root of 2640722566 is about 1382.2107263404.

The spelling of 2640722566 in words is "two billion, six hundred forty million, seven hundred twenty-two thousand, five hundred sixty-six".