1666223461 has 8 divisors (see below), whose sum is σ = 1944771840. Its totient is φ = 1397804208.

The previous prime is 1666223459. The next prime is 1666223483. The reversal of 1666223461 is 1643226661.

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 1666223461 - 2¹ = 1666223459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666223461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666223401) 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, 2531926 + ... + 2532583.

It is an arithmetic number, because the mean of its divisors is an integer number (243096480).

Almost surely, 2^1666223461 is an apocalyptic number.

It is an amenable number.

1666223461 is a deficient number, since it is larger than the sum of its proper divisors (278548379).

1666223461 is an equidigital number, since it uses as much as digits as its factorization.

1666223461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064563.

The product of its digits is 62208, while the sum is 37.

The square root of 1666223461 is about 40819.4005467988. The cubic root of 1666223461 is about 1185.5259964950.

The spelling of 1666223461 in words is "one billion, six hundred sixty-six million, two hundred twenty-three thousand, four hundred sixty-one".