646064266 has 8 divisors (see below), whose sum is σ = 971024544. Its totient is φ = 322389420.

The previous prime is 646064249. The next prime is 646064267. The reversal of 646064266 is 662460646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (646064267) 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, 320100 + ... + 322111.

It is an arithmetic number, because the mean of its divisors is an integer number (121378068).

Almost surely, 2^646064266 is an apocalyptic number.

646064266 is a deficient number, since it is larger than the sum of its proper divisors (324960278).

646064266 is a wasteful number, since it uses less digits than its factorization.

646064266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642716.

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 646064266 is about 25417.7942788118. The cubic root of 646064266 is about 864.4872125261.

The spelling of 646064266 in words is "six hundred forty-six million, sixty-four thousand, two hundred sixty-six".