668887411 has 4 divisors (see below), whose sum is σ = 669202552. Its totient is φ = 668572272.

The previous prime is 668887399. The next prime is 668887451. The reversal of 668887411 is 114788866.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668887411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668887451) 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, 154365 + ... + 158638.

It is an arithmetic number, because the mean of its divisors is an integer number (167300638).

Almost surely, 2^668887411 is an apocalyptic number.

668887411 is a deficient number, since it is larger than the sum of its proper divisors (315141).

668887411 is a wasteful number, since it uses less digits than its factorization.

668887411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315140.

The product of its digits is 516096, while the sum is 49.

The square root of 668887411 is about 25862.8577500631. The cubic root of 668887411 is about 874.5493890981.

The spelling of 668887411 in words is "six hundred sixty-eight million, eight hundred eighty-seven thousand, four hundred eleven".