668123412 has 96 divisors (see below), whose sum is σ = 1782466560. Its totient is φ = 192804480.

The previous prime is 668123411. The next prime is 668123473. The reversal of 668123412 is 214321866.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668123411) 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, 1089618 + ... + 1090230.

It is an arithmetic number, because the mean of its divisors is an integer number (18567360).

Almost surely, 2^668123412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668123412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891233280).

668123412 is an abundant number, since it is smaller than the sum of its proper divisors (1114343148).

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

668123412 is a wasteful number, since it uses less digits than its factorization.

668123412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1011 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 668123412 is about 25848.0833331990. The cubic root of 668123412 is about 874.2162939729.

The spelling of 668123412 in words is "six hundred sixty-eight million, one hundred twenty-three thousand, four hundred twelve".