1666115801 has 16 divisors (see below), whose sum is σ = 2033341440. Its totient is φ = 1334370240.

The previous prime is 1666115779. The next prime is 1666115813. The reversal of 1666115801 is 1085116661.

It is a de Polignac number, because none of the positive numbers 2^k-1666115801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666115851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126086 + ... + 138671.

It is an arithmetic number, because the mean of its divisors is an integer number (127083840).

Almost surely, 2^1666115801 is an apocalyptic number.

It is an amenable number.

1666115801 is a deficient number, since it is larger than the sum of its proper divisors (367225639).

1666115801 is a wasteful number, since it uses less digits than its factorization.

1666115801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264824.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 1666115801 is about 40818.0817898147. The cubic root of 1666115801 is about 1185.5004624093.

The spelling of 1666115801 in words is "one billion, six hundred sixty-six million, one hundred fifteen thousand, eight hundred one".