646534066 has 16 divisors (see below), whose sum is σ = 975179520. Its totient is φ = 321479280.

The previous prime is 646534051. The next prime is 646534067. The reversal of 646534066 is 660435646.

It is not an unprimeable number, because it can be changed into a prime (646534067) 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, 448575 + ... + 450013.

It is an arithmetic number, because the mean of its divisors is an integer number (60948720).

Almost surely, 2^646534066 is an apocalyptic number.

646534066 is a deficient number, since it is larger than the sum of its proper divisors (328645454).

646534066 is a wasteful number, since it uses less digits than its factorization.

646534066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529.

The product of its (nonzero) digits is 311040, while the sum is 40.

The square root of 646534066 is about 25427.0341565822. The cubic root of 646534066 is about 864.6967054563.

The spelling of 646534066 in words is "six hundred forty-six million, five hundred thirty-four thousand, sixty-six".