1666666676 has 12 divisors (see below), whose sum is σ = 2923942980. Its totient is φ = 831254400.

The previous prime is 1666666667. The next prime is 1666666679. The reversal of 1666666676 is 6766666661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 931714576 + 734952100 = 30524^2 + 27110^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666666679) 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, 517931 + ... + 521138.

It is an arithmetic number, because the mean of its divisors is an integer number (243661915).

Almost surely, 2^1666666676 is an apocalyptic number.

It is an amenable number.

1666666676 is a deficient number, since it is larger than the sum of its proper divisors (1257276304).

1666666676 is a wasteful number, since it uses less digits than its factorization.

1666666676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039474 (or 1039472 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 56.

The square root of 1666666676 is about 40824.8291606958. The cubic root of 1666666676 is about 1185.6311037099.

The spelling of 1666666676 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy-six".