668385767 has 4 divisors (see below), whose sum is σ = 763869456. Its totient is φ = 572902080.

The previous prime is 668385691. The next prime is 668385779. The reversal of 668385767 is 767583866.

It is a happy number.

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 668385767 - 2¹² = 668381671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668381767) 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, 47741834 + ... + 47741847.

It is an arithmetic number, because the mean of its divisors is an integer number (190967364).

Almost surely, 2^668385767 is an apocalyptic number.

668385767 is a deficient number, since it is larger than the sum of its proper divisors (95483689).

668385767 is an equidigital number, since it uses as much as digits as its factorization.

668385767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95483688.

The product of its digits is 10160640, while the sum is 56.

The square root of 668385767 is about 25853.1577761789. The cubic root of 668385767 is about 874.3307064690.

The spelling of 668385767 in words is "six hundred sixty-eight million, three hundred eighty-five thousand, seven hundred sixty-seven".