1666313611 has 4 divisors (see below), whose sum is σ = 1711349152. Its totient is φ = 1621278072.

The previous prime is 1666313603. The next prime is 1666313641. The reversal of 1666313611 is 1163136661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1666313611 - 2³ = 1666313603 is a prime.

It is a super-3 number, since 3×1666313611³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666313641) 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 3 ways as a sum of consecutive naturals, for example, 22517715 + ... + 22517788.

It is an arithmetic number, because the mean of its divisors is an integer number (427837288).

Almost surely, 2^1666313611 is an apocalyptic number.

1666313611 is a deficient number, since it is larger than the sum of its proper divisors (45035541).

1666313611 is an equidigital number, since it uses as much as digits as its factorization.

1666313611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45035540.

The product of its digits is 11664, while the sum is 34.

The square root of 1666313611 is about 40820.5047861978. The cubic root of 1666313611 is about 1185.5473768287.

The spelling of 1666313611 in words is "one billion, six hundred sixty-six million, three hundred thirteen thousand, six hundred eleven".