1662111661 has 8 divisors (see below), whose sum is σ = 1901469440. Its totient is φ = 1423232208.

The previous prime is 1662111653. The next prime is 1662111667. The reversal of 1662111661 is 1661112661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1662111661 - 2³ = 1662111653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662111667) 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 7 ways as a sum of consecutive naturals, for example, 112101 + ... + 126058.

It is an arithmetic number, because the mean of its divisors is an integer number (237683680).

Almost surely, 2^1662111661 is an apocalyptic number.

It is an amenable number.

1662111661 is a deficient number, since it is larger than the sum of its proper divisors (239357779).

1662111661 is an equidigital number, since it uses as much as digits as its factorization.

1662111661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239163.

The product of its digits is 2592, while the sum is 31.

The square root of 1662111661 is about 40769.0036792659. The cubic root of 1662111661 is about 1184.5500047402.

It can be divided in two parts, 16621 and 11661, that added together give a palindrome (28282).

The spelling of 1662111661 in words is "one billion, six hundred sixty-two million, one hundred eleven thousand, six hundred sixty-one".