668000666794 has 8 divisors (see below), whose sum is σ = 1002056058468. Its totient is φ = 333981980640.

The previous prime is 668000666791. The next prime is 668000666833. The reversal of 668000666794 is 497666000866.

668000666794 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 560589125625 + 107411541169 = 748725^2 + 327737^2 .

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

It is a super-2 number, since 2×668000666794² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668000666791) 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, 9130837 + ... + 9203704.

Almost surely, 2^668000666794 is an apocalyptic number.

668000666794 is a deficient number, since it is larger than the sum of its proper divisors (334055391674).

668000666794 is a wasteful number, since it uses less digits than its factorization.

668000666794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18352760.

The product of its (nonzero) digits is 15676416, while the sum is 58.

The spelling of 668000666794 in words is "six hundred sixty-eight billion, six hundred sixty-six thousand, seven hundred ninety-four".