1666114997 has 12 divisors (see below), whose sum is σ = 1761523020. Its totient is φ = 1575640512.

The previous prime is 1666114987. The next prime is 1666114999. The reversal of 1666114997 is 7994116661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 179935396 + 1486179601 = 13414^2 + 38551^2 .

It is not a de Polignac number, because 1666114997 - 2¹⁰ = 1666113973 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 (1666114999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217529 + ... + 225057.

It is an arithmetic number, because the mean of its divisors is an integer number (146793585).

Almost surely, 2^1666114997 is an apocalyptic number.

It is an amenable number.

1666114997 is a deficient number, since it is larger than the sum of its proper divisors (95408023).

1666114997 is an equidigital number, since it uses as much as digits as its factorization.

1666114997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8180 (or 8161 counting only the distinct ones).

The product of its digits is 489888, while the sum is 50.

The square root of 1666114997 is about 40818.0719412370. The cubic root of 1666114997 is about 1185.5002717178.

The spelling of 1666114997 in words is "one billion, six hundred sixty-six million, one hundred fourteen thousand, nine hundred ninety-seven".