664883819 has 8 divisors (see below), whose sum is σ = 670602240. Its totient is φ = 659175400.

The previous prime is 664883767. The next prime is 664883827. The reversal of 664883819 is 918388466.

664883819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 664883819 - 2¹⁶ = 664818283 is a prime.

It is a super-2 number, since 2×664883819² = 884140985536049522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664883119) 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, 196262 + ... + 199620.

It is an arithmetic number, because the mean of its divisors is an integer number (83825280).

Almost surely, 2^664883819 is an apocalyptic number.

664883819 is a deficient number, since it is larger than the sum of its proper divisors (5718421).

664883819 is a wasteful number, since it uses less digits than its factorization.

664883819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5001.

The product of its digits is 1990656, while the sum is 53.

The square root of 664883819 is about 25785.3411650884. The cubic root of 664883819 is about 872.8010390776.

It can be divided in two parts, 66488 and 3819, that added together give a palindrome (70307).

The spelling of 664883819 in words is "six hundred sixty-four million, eight hundred eighty-three thousand, eight hundred nineteen".