1664481718 has 8 divisors (see below), whose sum is σ = 2496899160. Its totient is φ = 832182000.

The previous prime is 1664481701. The next prime is 1664481743. The reversal of 1664481718 is 8171844661.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29593 + ... + 64843.

It is an arithmetic number, because the mean of its divisors is an integer number (312112395).

Almost surely, 2^1664481718 is an apocalyptic number.

1664481718 is a deficient number, since it is larger than the sum of its proper divisors (832417442).

1664481718 is a wasteful number, since it uses less digits than its factorization.

1664481718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58862.

The product of its digits is 258048, while the sum is 46.

The square root of 1664481718 is about 40798.0602234959. The cubic root of 1664481718 is about 1185.1127663046.

The spelling of 1664481718 in words is "one billion, six hundred sixty-four million, four hundred eighty-one thousand, seven hundred eighteen".