667222766 has 64 divisors (see below), whose sum is σ = 1254766464. Its totient is φ = 259584000.

The previous prime is 667222757. The next prime is 667222793.

667222766 is nontrivially palindromic in base 10.

667222766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 985220 + ... + 985896.

It is an arithmetic number, because the mean of its divisors is an integer number (19605726).

Almost surely, 2^667222766 is an apocalyptic number.

667222766 is a deficient number, since it is larger than the sum of its proper divisors (587543698).

667222766 is a wasteful number, since it uses less digits than its factorization.

667222766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its digits is 508032, while the sum is 44.

The square root of 667222766 is about 25830.6555472369. The cubic root of 667222766 is about 873.8232959867.

The spelling of 667222766 in words is "six hundred sixty-seven million, two hundred twenty-two thousand, seven hundred sixty-six".