668555059 has 4 divisors (see below), whose sum is σ = 679515040. Its totient is φ = 657595080.

The previous prime is 668554993. The next prime is 668555077. The reversal of 668555059 is 950555866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668555059 - 2¹⁹ = 668030771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668555089) 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, 5479899 + ... + 5480020.

It is an arithmetic number, because the mean of its divisors is an integer number (169878760).

Almost surely, 2^668555059 is an apocalyptic number.

668555059 is a deficient number, since it is larger than the sum of its proper divisors (10959981).

668555059 is a wasteful number, since it uses less digits than its factorization.

668555059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10959980.

The product of its (nonzero) digits is 1620000, while the sum is 49.

The square root of 668555059 is about 25856.4316756972. The cubic root of 668555059 is about 874.4045184831.

The spelling of 668555059 in words is "six hundred sixty-eight million, five hundred fifty-five thousand, fifty-nine".