667726627766 has 16 divisors (see below), whose sum is σ = 1095452439120. Its totient is φ = 302731862880.

The previous prime is 667726627727. The next prime is 667726627819.

667726627766 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 667726627696 and 667726627705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39003281 + ... + 39020396.

It is an arithmetic number, because the mean of its divisors is an integer number (68465777445).

Almost surely, 2^667726627766 is an apocalyptic number.

667726627766 is a deficient number, since it is larger than the sum of its proper divisors (427725811354).

667726627766 is a wasteful number, since it uses less digits than its factorization.

667726627766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78024079.

The product of its digits is 448084224, while the sum is 68.

The spelling of 667726627766 in words is "six hundred sixty-seven billion, seven hundred twenty-six million, six hundred twenty-seven thousand, seven hundred sixty-six".