668356289 has 16 divisors (see below), whose sum is σ = 689438400. Its totient is φ = 647697600.

The previous prime is 668356259. The next prime is 668356291. The reversal of 668356289 is 982653866.

It is a cyclic number.

It is not a de Polignac number, because 668356289 - 2⁸ = 668356033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668356289.

It is not an unprimeable number, because it can be changed into a prime (668356219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1914887 + ... + 1915235.

It is an arithmetic number, because the mean of its divisors is an integer number (43089900).

Almost surely, 2^668356289 is an apocalyptic number.

It is an amenable number.

668356289 is a deficient number, since it is larger than the sum of its proper divisors (21082111).

668356289 is a wasteful number, since it uses less digits than its factorization.

668356289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800.

The product of its digits is 3732480, while the sum is 53.

The square root of 668356289 is about 25852.5876654543. The cubic root of 668356289 is about 874.3178526647.

The spelling of 668356289 in words is "six hundred sixty-eight million, three hundred fifty-six thousand, two hundred eighty-nine".