668633355830 has 64 divisors (see below), whose sum is σ = 1388362622976. Its totient is φ = 229557216000.

The previous prime is 668633355827. The next prime is 668633355853. The reversal of 668633355830 is 38553336866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2251412 + ... + 2531031.

It is an arithmetic number, because the mean of its divisors is an integer number (21693165984).

Almost surely, 2^668633355830 is an apocalyptic number.

668633355830 is an abundant number, since it is smaller than the sum of its proper divisors (719729267146).

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

668633355830 is a wasteful number, since it uses less digits than its factorization.

668633355830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782533.

The product of its (nonzero) digits is 27993600, while the sum is 56.

The spelling of 668633355830 in words is "six hundred sixty-eight billion, six hundred thirty-three million, three hundred fifty-five thousand, eight hundred thirty".