666794730626 has 8 divisors (see below), whose sum is σ = 1010094988284. Its totient is φ = 330096401200.

The previous prime is 666794730601. The next prime is 666794730629. The reversal of 666794730626 is 626037497666.

It is a Cunningham number, because it is equal to 816575²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 666794730625 + 1 = 816575^2 + 1^2 .

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

It is not an unprimeable number, because it can be changed into a prime (666794730629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650481805 + ... + 1650482208.

Almost surely, 2^666794730626 is an apocalyptic number.

666794730626 is a deficient number, since it is larger than the sum of its proper divisors (343300257658).

666794730626 is a wasteful number, since it uses less digits than its factorization.

666794730626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300964116.

The product of its (nonzero) digits is 82301184, while the sum is 62.

The spelling of 666794730626 in words is "six hundred sixty-six billion, seven hundred ninety-four million, seven hundred thirty thousand, six hundred twenty-six".