645441643466 has 32 divisors (see below), whose sum is σ = 1083078216000. Its totient is φ = 286681289472.

The previous prime is 645441643453. The next prime is 645441643499. The reversal of 645441643466 is 664346144546.

645441643466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1683356 + ... + 2030903.

It is an arithmetic number, because the mean of its divisors is an integer number (33846194250).

Almost surely, 2^645441643466 is an apocalyptic number.

645441643466 is a deficient number, since it is larger than the sum of its proper divisors (437636572534).

645441643466 is a wasteful number, since it uses less digits than its factorization.

645441643466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714566.

The product of its digits is 19906560, while the sum is 53.

The spelling of 645441643466 in words is "six hundred forty-five billion, four hundred forty-one million, six hundred forty-three thousand, four hundred sixty-six".