646646133 has 16 divisors (see below), whose sum is σ = 1037227520. Its totient is φ = 350063856.

The previous prime is 646646131. The next prime is 646646149. The reversal of 646646133 is 331646646.

It is not a de Polignac number, because 646646133 - 2¹ = 646646131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646646091 and 646646100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646646131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 809935 + ... + 810732.

It is an arithmetic number, because the mean of its divisors is an integer number (64826720).

Almost surely, 2^646646133 is an apocalyptic number.

It is an amenable number.

646646133 is a deficient number, since it is larger than the sum of its proper divisors (390581387).

646646133 is a wasteful number, since it uses less digits than its factorization.

646646133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620696.

The product of its digits is 186624, while the sum is 39.

The square root of 646646133 is about 25429.2377589262. The cubic root of 646646133 is about 864.7466633123.

The spelling of 646646133 in words is "six hundred forty-six million, six hundred forty-six thousand, one hundred thirty-three".