645066321033 has 8 divisors (see below), whose sum is σ = 876316511808. Its totient is φ = 421930172144.

The previous prime is 645066321013. The next prime is 645066321037. The reversal of 645066321033 is 330123660546.

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 645066321033 - 2¹⁰ = 645066320009 is a prime.

It is a super-2 number, since 2×645066321033² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645066320982 and 645066321000.

It is not an unprimeable number, because it can be changed into a prime (645066321037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2028510285 + ... + 2028510602.

It is an arithmetic number, because the mean of its divisors is an integer number (109539563976).

Almost surely, 2^645066321033 is an apocalyptic number.

It is an amenable number.

645066321033 is a deficient number, since it is larger than the sum of its proper divisors (231250190775).

645066321033 is a wasteful number, since it uses less digits than its factorization.

645066321033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057020943.

The product of its (nonzero) digits is 233280, while the sum is 39.

Adding to 645066321033 its reverse (330123660546), we get a palindrome (975189981579).

The spelling of 645066321033 in words is "six hundred forty-five billion, sixty-six million, three hundred twenty-one thousand, thirty-three".