1666063247 has 4 divisors (see below), whose sum is σ = 1666211736. Its totient is φ = 1665914760.

The previous prime is 1666063211. The next prime is 1666063277. The reversal of 1666063247 is 7423606661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7423606661 = 23 ⋅322765507.

It is a cyclic number.

It is not a de Polignac number, because 1666063247 - 2⁸ = 1666062991 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 (1666063277) 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, 55904 + ... + 80357.

It is an arithmetic number, because the mean of its divisors is an integer number (416552934).

Almost surely, 2^1666063247 is an apocalyptic number.

1666063247 is a deficient number, since it is larger than the sum of its proper divisors (148489).

1666063247 is a wasteful number, since it uses less digits than its factorization.

1666063247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148488.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 1666063247 is about 40817.4380259222. The cubic root of 1666063247 is about 1185.4879976001.

The spelling of 1666063247 in words is "one billion, six hundred sixty-six million, sixty-three thousand, two hundred forty-seven".