645813936233 has 8 divisors (see below), whose sum is σ = 686139691080. Its totient is φ = 606691935360.

The previous prime is 645813936223. The next prime is 645813936253. The reversal of 645813936233 is 332639318546.

It can be written as a sum of positive squares in 4 ways, for example, as 45387319849 + 600426616384 = 213043^2 + 774872^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645813936233 - 2¹⁶ = 645813870697 is a prime.

It is a super-2 number, since 2×645813936233² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645813936223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300937388 + ... + 300939533.

It is an arithmetic number, because the mean of its divisors is an integer number (85767461385).

Almost surely, 2^645813936233 is an apocalyptic number.

It is an amenable number.

645813936233 is a deficient number, since it is larger than the sum of its proper divisors (40325754847).

645813936233 is a wasteful number, since it uses less digits than its factorization.

645813936233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601876987.

The product of its digits is 8398080, while the sum is 53.

The spelling of 645813936233 in words is "six hundred forty-five billion, eight hundred thirteen million, nine hundred thirty-six thousand, two hundred thirty-three".