668055571 has 8 divisors (see below), whose sum is σ = 691387920. Its totient is φ = 644743008.

The previous prime is 668055547. The next prime is 668055601. The reversal of 668055571 is 175550866.

668055571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668055571 - 2¹¹ = 668053523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668052571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107080 + ... + 113146.

It is an arithmetic number, because the mean of its divisors is an integer number (86423490).

Almost surely, 2^668055571 is an apocalyptic number.

668055571 is a deficient number, since it is larger than the sum of its proper divisors (23332349).

668055571 is a wasteful number, since it uses less digits than its factorization.

668055571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9893.

The product of its (nonzero) digits is 252000, while the sum is 43.

The square root of 668055571 is about 25846.7709975540. The cubic root of 668055571 is about 874.1867037735.

The spelling of 668055571 in words is "six hundred sixty-eight million, fifty-five thousand, five hundred seventy-one".