66439000663 has 16 divisors (see below), whose sum is σ = 77253073920. Its totient is φ = 55956520800.

The previous prime is 66439000657. The next prime is 66439000801. The reversal of 66439000663 is 36600093466.

It is a cyclic number.

It is not a de Polignac number, because 66439000663 - 2⁵ = 66439000631 is a prime.

It is a super-2 number, since 2×66439000663² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66439000603) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 881058 + ... + 953488.

It is an arithmetic number, because the mean of its divisors is an integer number (4828317120).

Almost surely, 2^66439000663 is an apocalyptic number.

66439000663 is a deficient number, since it is larger than the sum of its proper divisors (10814073257).

66439000663 is a wasteful number, since it uses less digits than its factorization.

66439000663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74718.

The product of its (nonzero) digits is 419904, while the sum is 43.

The spelling of 66439000663 in words is "sixty-six billion, four hundred thirty-nine million, six hundred sixty-three", and thus it is an aban number.