645828686383 has 4 divisors (see below), whose sum is σ = 645832779480. Its totient is φ = 645824593288.

The previous prime is 645828686353. The next prime is 645828686401. The reversal of 645828686383 is 383686828546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645828686383 - 2⁹ = 645828685871 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645828686333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1799968 + ... + 2128741.

It is an arithmetic number, because the mean of its divisors is an integer number (161458194870).

Almost surely, 2^645828686383 is an apocalyptic number.

645828686383 is a deficient number, since it is larger than the sum of its proper divisors (4093097).

645828686383 is a wasteful number, since it uses less digits than its factorization.

645828686383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4093096.

The product of its digits is 318504960, while the sum is 67.

The spelling of 645828686383 in words is "six hundred forty-five billion, eight hundred twenty-eight million, six hundred eighty-six thousand, three hundred eighty-three".