645884575018 has 16 divisors (see below), whose sum is σ = 973064885760. Its totient is φ = 321531013296.

The previous prime is 645884575009. The next prime is 645884575027. The reversal of 645884575018 is 810575488546.

645884575018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645884575009) and next prime (645884575027).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576196 + ... + 1274272.

It is an arithmetic number, because the mean of its divisors is an integer number (60816555360).

Almost surely, 2^645884575018 is an apocalyptic number.

645884575018 is a deficient number, since it is larger than the sum of its proper divisors (327180310742).

645884575018 is a wasteful number, since it uses less digits than its factorization.

645884575018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700101.

The product of its (nonzero) digits is 43008000, while the sum is 61.

The spelling of 645884575018 in words is "six hundred forty-five billion, eight hundred eighty-four million, five hundred seventy-five thousand, eighteen".