1645334664 has 32 divisors (see below), whose sum is σ = 4355298720. Its totient is φ = 516183296.

The previous prime is 1645334653. The next prime is 1645334689. The reversal of 1645334664 is 4664335461.

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, 2015934 + ... + 2016749.

It is an arithmetic number, because the mean of its divisors is an integer number (136103085).

Almost surely, 2^1645334664 is an apocalyptic number.

It is an amenable number.

1645334664 is an abundant number, since it is smaller than the sum of its proper divisors (2709964056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645334664 is a wasteful number, since it uses less digits than its factorization.

1645334664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032709 (or 4032705 counting only the distinct ones).

The product of its digits is 622080, while the sum is 42.

The square root of 1645334664 is about 40562.7250563864. The cubic root of 1645334664 is about 1180.5509884923.

The spelling of 1645334664 in words is "one billion, six hundred forty-five million, three hundred thirty-four thousand, six hundred sixty-four".