668155343 has 4 divisors (see below), whose sum is σ = 671322168. Its totient is φ = 664988520.

The previous prime is 668155339. The next prime is 668155351. The reversal of 668155343 is 343551866.

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 668155343 - 2² = 668155339 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 668155343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668155333) 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, 1583096 + ... + 1583517.

It is an arithmetic number, because the mean of its divisors is an integer number (167830542).

Almost surely, 2^668155343 is an apocalyptic number.

668155343 is a deficient number, since it is larger than the sum of its proper divisors (3166825).

668155343 is a wasteful number, since it uses less digits than its factorization.

668155343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166824.

The product of its digits is 259200, while the sum is 41.

The square root of 668155343 is about 25848.7009925064. The cubic root of 668155343 is about 874.2302206195.

The spelling of 668155343 in words is "six hundred sixty-eight million, one hundred fifty-five thousand, three hundred forty-three".