645661351333 has 8 divisors (see below), whose sum is σ = 647559249120. Its totient is φ = 643766168880.

The previous prime is 645661351331. The next prime is 645661351351. The reversal of 645661351333 is 333153166546.

645661351333 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 645661351333 - 2¹ = 645661351331 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645661351331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202078 + ... + 1154191.

It is an arithmetic number, because the mean of its divisors is an integer number (80944906140).

Almost surely, 2^645661351333 is an apocalyptic number.

It is an amenable number.

645661351333 is a deficient number, since it is larger than the sum of its proper divisors (1897897787).

645661351333 is a wasteful number, since it uses less digits than its factorization.

645661351333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357667.

The product of its digits is 1749600, while the sum is 46.

The spelling of 645661351333 in words is "six hundred forty-five billion, six hundred sixty-one million, three hundred fifty-one thousand, three hundred thirty-three".