668933771 has 8 divisors (see below), whose sum is σ = 761474304. Its totient is φ = 581681320.

The previous prime is 668933729. The next prime is 668933803. The reversal of 668933771 is 177339866.

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

It is a de Polignac number, because none of the positive numbers 2^k-668933771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668933971) 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 7 ways as a sum of consecutive naturals, for example, 1321751 + ... + 1322256.

It is an arithmetic number, because the mean of its divisors is an integer number (95184288).

Almost surely, 2^668933771 is an apocalyptic number.

668933771 is a deficient number, since it is larger than the sum of its proper divisors (92540533).

668933771 is a wasteful number, since it uses less digits than its factorization.

668933771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644041.

The product of its digits is 1143072, while the sum is 50.

The square root of 668933771 is about 25863.7540005313. The cubic root of 668933771 is about 874.5695933818.

It can be divided in two parts, 668 and 933771, that added together give a palindrome (934439).

The spelling of 668933771 in words is "six hundred sixty-eight million, nine hundred thirty-three thousand, seven hundred seventy-one".