1055806666 has 32 divisors (see below), whose sum is σ = 1635051600. Its totient is φ = 511142400.

The previous prime is 1055806663. The next prime is 1055806669. The reversal of 1055806666 is 6666085501.

It is an interprime number because it is at equal distance from previous prime (1055806663) and next prime (1055806669).

It can be written as a sum of positive squares in 8 ways, for example, as 97594641 + 958212025 = 9879^2 + 30955^2 .

It is a super-2 number, since 2×1055806666² = 2229455431940071112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1055806663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3025060 + ... + 3025408.

Almost surely, 2^1055806666 is an apocalyptic number.

1055806666 is a deficient number, since it is larger than the sum of its proper divisors (579244934).

1055806666 is a wasteful number, since it uses less digits than its factorization.

1055806666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730.

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 1055806666 is about 32493.1787610877. The cubic root of 1055806666 is about 1018.2665244458.

The spelling of 1055806666 in words is "one billion, fifty-five million, eight hundred six thousand, six hundred sixty-six".