645111133 has 8 divisors (see below), whose sum is σ = 656480160. Its totient is φ = 633756720.

The previous prime is 645111127. The next prime is 645111151. The reversal of 645111133 is 331111546.

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 645111133 - 2²⁹ = 108240221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645111098 and 645111107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645111163) 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, 123766 + ... + 128872.

It is an arithmetic number, because the mean of its divisors is an integer number (82060020).

Almost surely, 2^645111133 is an apocalyptic number.

It is an amenable number.

645111133 is a deficient number, since it is larger than the sum of its proper divisors (11369027).

645111133 is a wasteful number, since it uses less digits than its factorization.

645111133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307.

The product of its digits is 1080, while the sum is 25.

The square root of 645111133 is about 25399.0380329649. The cubic root of 645111133 is about 864.0618798023.

Adding to 645111133 its reverse (331111546), we get a palindrome (976222679).

The spelling of 645111133 in words is "six hundred forty-five million, one hundred eleven thousand, one hundred thirty-three".