668581180 has 12 divisors (see below), whose sum is σ = 1404020520. Its totient is φ = 267432464.

The previous prime is 668581153. The next prime is 668581189. The reversal of 668581180 is 81185866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668581189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16714510 + ... + 16714549.

It is an arithmetic number, because the mean of its divisors is an integer number (117001710).

Almost surely, 2^668581180 is an apocalyptic number.

It is an amenable number.

668581180 is an abundant number, since it is smaller than the sum of its proper divisors (735439340).

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

668581180 is a wasteful number, since it uses less digits than its factorization.

668581180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33429068 (or 33429066 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 668581180 is about 25856.9367868663. The cubic root of 668581180 is about 874.4159062377.

The spelling of 668581180 in words is "six hundred sixty-eight million, five hundred eighty-one thousand, one hundred eighty".