66490490464 has 24 divisors (see below), whose sum is σ = 131201365680. Its totient is φ = 33169508736.

The previous prime is 66490490449. The next prime is 66490490483. The reversal of 66490490464 is 46409409466.

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, 2352499 + ... + 2380594.

It is an arithmetic number, because the mean of its divisors is an integer number (5466723570).

Almost surely, 2^66490490464 is an apocalyptic number.

It is an amenable number.

66490490464 is a deficient number, since it is larger than the sum of its proper divisors (64710875216).

66490490464 is a wasteful number, since it uses less digits than its factorization.

66490490464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733542 (or 4733534 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 52.

The spelling of 66490490464 in words is "sixty-six billion, four hundred ninety million, four hundred ninety thousand, four hundred sixty-four".