666562880 has 28 divisors (see below), whose sum is σ = 1587253620. Its totient is φ = 266625024.

The previous prime is 666562873. The next prime is 666562889. The reversal of 666562880 is 88265666.

It is a happy number.

666562880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 495685696 + 170877184 = 22264^2 + 13072^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666562889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041185 + ... + 1041824.

Almost surely, 2^666562880 is an apocalyptic number.

It is an amenable number.

666562880 is an abundant number, since it is smaller than the sum of its proper divisors (920690740).

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

666562880 is a wasteful number, since it uses less digits than its factorization.

666562880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083026 (or 2083016 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 666562880 is about 25817.8790763300. The cubic root of 666562880 is about 873.5351293814.

The spelling of 666562880 in words is "six hundred sixty-six million, five hundred sixty-two thousand, eight hundred eighty".