645312771333 has 24 divisors (see below), whose sum is σ = 934564587840. Its totient is φ = 429079907520.

The previous prime is 645312771289. The next prime is 645312771407. The reversal of 645312771333 is 333177213546.

645312771333 is a `hidden beast` number, since 6 + 4 + 531 + 2 + 77 + 13 + 33 = 666.

It is not a de Polignac number, because 645312771333 - 2⁶ = 645312771269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645312771133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26796688 + ... + 26820758.

It is an arithmetic number, because the mean of its divisors is an integer number (38940191160).

Almost surely, 2^645312771333 is an apocalyptic number.

It is an amenable number.

645312771333 is a deficient number, since it is larger than the sum of its proper divisors (289251816507).

645312771333 is a wasteful number, since it uses less digits than its factorization.

645312771333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31769 (or 31766 counting only the distinct ones).

The product of its digits is 952560, while the sum is 45.

Adding to 645312771333 its reverse (333177213546), we get a palindrome (978489984879).

The spelling of 645312771333 in words is "six hundred forty-five billion, three hundred twelve million, seven hundred seventy-one thousand, three hundred thirty-three".