646522266 has 32 divisors (see below), whose sum is σ = 1406881728. Its totient is φ = 196876800.

The previous prime is 646522241. The next prime is 646522277. The reversal of 646522266 is 662225646.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35160 + ... + 50291.

It is an arithmetic number, because the mean of its divisors is an integer number (43965054).

Almost surely, 2^646522266 is an apocalyptic number.

646522266 is an abundant number, since it is smaller than the sum of its proper divisors (760359462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646522266 is a wasteful number, since it uses less digits than its factorization.

646522266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85566.

The product of its digits is 207360, while the sum is 39.

The square root of 646522266 is about 25426.8021190239. The cubic root of 646522266 is about 864.6914448502.

The spelling of 646522266 in words is "six hundred forty-six million, five hundred twenty-two thousand, two hundred sixty-six".