1666248463 has 4 divisors (see below), whose sum is σ = 1817725608. Its totient is φ = 1514771320.

The previous prime is 1666248439. The next prime is 1666248497. The reversal of 1666248463 is 3648426661.

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 1666248463 - 2⁵ = 1666248431 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 (1666248403) 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, 75738556 + ... + 75738577.

It is an arithmetic number, because the mean of its divisors is an integer number (454431402).

Almost surely, 2^1666248463 is an apocalyptic number.

1666248463 is a deficient number, since it is larger than the sum of its proper divisors (151477145).

1666248463 is a wasteful number, since it uses less digits than its factorization.

1666248463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151477144.

The product of its digits is 995328, while the sum is 46.

The square root of 1666248463 is about 40819.7067970852. The cubic root of 1666248463 is about 1185.5319261463.

The spelling of 1666248463 in words is "one billion, six hundred sixty-six million, two hundred forty-eight thousand, four hundred sixty-three".