1666666666 has 16 divisors (see below), whose sum is σ = 2858400000. Its totient is φ = 713971440.

The previous prime is 1666666649. The next prime is 1666666667. The reversal of 1666666666 is 6666666661.

1666666666 is a modest number, since divided by 66666 gives 16666 as remainder.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1666666667) 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, 8335 + ... + 58333.

It is an arithmetic number, because the mean of its divisors is an integer number (178650000).

Almost surely, 2^1666666666 is an apocalyptic number.

1666666666 is a deficient number, since it is larger than the sum of its proper divisors (1191733334).

1666666666 is a wasteful number, since it uses less digits than its factorization.

1666666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52389.

The product of its digits is 10077696, while the sum is 55.

The square root of 1666666666 is about 40824.8290382213. The cubic root of 1666666666 is about 1185.6311013386.

The spelling of 1666666666 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-six".