668667746 has 8 divisors (see below), whose sum is σ = 1008605520. Its totient is φ = 332465908.

The previous prime is 668667739. The next prime is 668667763. The reversal of 668667746 is 647766866.

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

It is a junction number, because it is equal to n+sod(n) for n = 668667691 and 668667700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933536 + ... + 934251.

It is an arithmetic number, because the mean of its divisors is an integer number (126075690).

Almost surely, 2^668667746 is an apocalyptic number.

668667746 is a deficient number, since it is larger than the sum of its proper divisors (339937774).

668667746 is a wasteful number, since it uses less digits than its factorization.

668667746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867968.

The product of its digits is 12192768, while the sum is 56.

The square root of 668667746 is about 25858.6106742029. The cubic root of 668667746 is about 874.4536435751.

The spelling of 668667746 in words is "six hundred sixty-eight million, six hundred sixty-seven thousand, seven hundred forty-six".