646264066 has 32 divisors (see below), whose sum is σ = 1123632000. Its totient is φ = 273052032.

The previous prime is 646264019. The next prime is 646264067. The reversal of 646264066 is 660462646.

It is not an unprimeable number, because it can be changed into a prime (646264067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 633705 + ... + 634723.

It is an arithmetic number, because the mean of its divisors is an integer number (35113500).

Almost surely, 2^646264066 is an apocalyptic number.

646264066 is a deficient number, since it is larger than the sum of its proper divisors (477367934).

646264066 is a wasteful number, since it uses less digits than its factorization.

646264066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626.

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

The square root of 646264066 is about 25421.7242924236. The cubic root of 646264066 is about 864.5763196278.

The spelling of 646264066 in words is "six hundred forty-six million, two hundred sixty-four thousand, sixty-six".