1067665666 has 16 divisors (see below), whose sum is σ = 1641546648. Its totient is φ = 520499200.

The previous prime is 1067665663. The next prime is 1067665721. The reversal of 1067665666 is 6665667601.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 436601025 + 631064641 = 20895^2 + 25121^2 .

It is a super-2 number, since 2×1067665666² = 2279819948710447112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1067665663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193506 + ... + 198946.

Almost surely, 2^1067665666 is an apocalyptic number.

1067665666 is a deficient number, since it is larger than the sum of its proper divisors (573880982).

1067665666 is a wasteful number, since it uses less digits than its factorization.

1067665666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7877.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The square root of 1067665666 is about 32675.1536492179. The cubic root of 1067665666 is about 1022.0647864179.

The spelling of 1067665666 in words is "one billion, sixty-seven million, six hundred sixty-five thousand, six hundred sixty-six".