645433143564 has 96 divisors (see below), whose sum is σ = 1660548314880. Its totient is φ = 193490464000.

The previous prime is 645433143557. The next prime is 645433143611. The reversal of 645433143564 is 465341334546.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16765762 + ... + 16804214.

It is an arithmetic number, because the mean of its divisors is an integer number (17297378280).

Almost surely, 2^645433143564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645433143564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (830274157440).

645433143564 is an abundant number, since it is smaller than the sum of its proper divisors (1015115171316).

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

645433143564 is a wasteful number, since it uses less digits than its factorization.

645433143564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39831 (or 39829 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 48.

The spelling of 645433143564 in words is "six hundred forty-five billion, four hundred thirty-three million, one hundred forty-three thousand, five hundred sixty-four".