668533810 has 64 divisors (see below), whose sum is σ = 1497657600. Its totient is φ = 209647872.

The previous prime is 668533783. The next prime is 668533819. The reversal of 668533810 is 18335866.

It is a super-2 number, since 2×668533810² = 893874910226232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668533819) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 29904 + ... + 47236.

It is an arithmetic number, because the mean of its divisors is an integer number (23400900).

Almost surely, 2^668533810 is an apocalyptic number.

668533810 is an abundant number, since it is smaller than the sum of its proper divisors (829123790).

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

668533810 is a wasteful number, since it uses less digits than its factorization.

668533810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17395.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 668533810 is about 25856.0207688654. The cubic root of 668533810 is about 874.3952545148.

The spelling of 668533810 in words is "six hundred sixty-eight million, five hundred thirty-three thousand, eight hundred ten".