668666752 has 48 divisors (see below), whose sum is σ = 1442508480. Its totient is φ = 308605440.

The previous prime is 668666737. The next prime is 668666759. The reversal of 668666752 is 257666866.

It is a super-3 number, since 3×668666752³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 668666752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668666759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6177 + ... + 37087.

It is an arithmetic number, because the mean of its divisors is an integer number (30052260).

Almost surely, 2^668666752 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 668666752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721254240).

668666752 is an abundant number, since it is smaller than the sum of its proper divisors (773841728).

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

668666752 is a wasteful number, since it uses less digits than its factorization.

668666752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30951 (or 30926 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The square root of 668666752 is about 25858.5914542923. The cubic root of 668666752 is about 874.4532102720.

The spelling of 668666752 in words is "six hundred sixty-eight million, six hundred sixty-six thousand, seven hundred fifty-two".