668253942 has 64 divisors (see below), whose sum is σ = 1522195200. Its totient is φ = 217235520.

The previous prime is 668253941. The next prime is 668253947. The reversal of 668253942 is 249352866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668253941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 435717 + ... + 437247.

It is an arithmetic number, because the mean of its divisors is an integer number (23784300).

Almost surely, 2^668253942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668253942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (761097600).

668253942 is an abundant number, since it is smaller than the sum of its proper divisors (853941258).

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

668253942 is a wasteful number, since it uses less digits than its factorization.

668253942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738 (or 1732 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 668253942 is about 25850.6081553220. The cubic root of 668253942 is about 874.2732215906.

The spelling of 668253942 in words is "six hundred sixty-eight million, two hundred fifty-three thousand, nine hundred forty-two".