668255780 has 12 divisors (see below), whose sum is σ = 1403337180. Its totient is φ = 267302304.

The previous prime is 668255701. The next prime is 668255813. The reversal of 668255780 is 87552866.

It can be written as a sum of positive squares in 2 ways, for example, as 468203044 + 200052736 = 21638^2 + 14144^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16706375 + ... + 16706414.

It is an arithmetic number, because the mean of its divisors is an integer number (116944765).

Almost surely, 2^668255780 is an apocalyptic number.

It is an amenable number.

668255780 is an abundant number, since it is smaller than the sum of its proper divisors (735081400).

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

668255780 is a wasteful number, since it uses less digits than its factorization.

668255780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33412798 (or 33412796 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 668255780 is about 25850.6437057184. The cubic root of 668255780 is about 874.2740231385.

The spelling of 668255780 in words is "six hundred sixty-eight million, two hundred fifty-five thousand, seven hundred eighty".