668350187 has 4 divisors (see below), whose sum is σ = 668404296. Its totient is φ = 668296080.

The previous prime is 668350183. The next prime is 668350219. The reversal of 668350187 is 781053866.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 668350187 - 2² = 668350183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668350181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1568 + ... + 36594.

It is an arithmetic number, because the mean of its divisors is an integer number (167101074).

Almost surely, 2^668350187 is an apocalyptic number.

668350187 is a deficient number, since it is larger than the sum of its proper divisors (54109).

668350187 is a wasteful number, since it uses less digits than its factorization.

668350187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54108.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 668350187 is about 25852.4696499193. The cubic root of 668350187 is about 874.3151918565.

The spelling of 668350187 in words is "six hundred sixty-eight million, three hundred fifty thousand, one hundred eighty-seven".