645633324912 has 20 divisors (see below), whose sum is σ = 1667886089480. Its totient is φ = 215211108288.

The previous prime is 645633324851. The next prime is 645633324953. The reversal of 645633324912 is 219423336546.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 13450694269 = 645633324912 / (6 + 4 + 5 + 6 + 3 + 3 + 3 + 2 + 4 + 9 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6725347087 + ... + 6725347182.

It is an arithmetic number, because the mean of its divisors is an integer number (83394304474).

Almost surely, 2^645633324912 is an apocalyptic number.

It is an amenable number.

645633324912 is an abundant number, since it is smaller than the sum of its proper divisors (1022252764568).

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

645633324912 is a wasteful number, since it uses less digits than its factorization.

645633324912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13450694280 (or 13450694274 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 48.

The spelling of 645633324912 in words is "six hundred forty-five billion, six hundred thirty-three million, three hundred twenty-four thousand, nine hundred twelve".