645623223300 has 432 divisors, whose sum is σ = 2240640589824. Its totient is φ = 154191840000.

The previous prime is 645623223299. The next prime is 645623223313. The reversal of 645623223300 is 3322326546.

645623223300 is a `hidden beast` number, since 6 + 4 + 5 + 623 + 2 + 23 + 3 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 202324705 + ... + 202327895.

It is an arithmetic number, because the mean of its divisors is an integer number (5186668032).

Almost surely, 2^645623223300 is an apocalyptic number.

645623223300 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645623223300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120320294912).

645623223300 is an abundant number, since it is smaller than the sum of its proper divisors (1595017366524).

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

645623223300 is a wasteful number, since it uses less digits than its factorization.

645623223300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520 (or 3510 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 36.

Adding to 645623223300 its reverse (3322326546), we get a palindrome (648945549846).

The spelling of 645623223300 in words is "six hundred forty-five billion, six hundred twenty-three million, two hundred twenty-three thousand, three hundred".