1646266666 has 16 divisors (see below), whose sum is σ = 2835675360. Its totient is φ = 708918480.

The previous prime is 1646266639. The next prime is 1646266667. The reversal of 1646266666 is 6666626461.

1646266666 is a modest number, since divided by 66666 gives 16462 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1646266667) 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, 1968801 + ... + 1969636.

It is an arithmetic number, because the mean of its divisors is an integer number (177229710).

Almost surely, 2^1646266666 is an apocalyptic number.

1646266666 is a deficient number, since it is larger than the sum of its proper divisors (1189408694).

1646266666 is a wasteful number, since it uses less digits than its factorization.

1646266666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938469.

The product of its digits is 2239488, while the sum is 49.

The square root of 1646266666 is about 40574.2118346124. The cubic root of 1646266666 is about 1180.7738546404.

The spelling of 1646266666 in words is "one billion, six hundred forty-six million, two hundred sixty-six thousand, six hundred sixty-six".