66590967816 has 96 divisors (see below), whose sum is σ = 186386054400. Its totient is φ = 21455832960.

The previous prime is 66590967809. The next prime is 66590967889. The reversal of 66590967816 is 61876909566.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1940455 + ... + 1974473.

It is an arithmetic number, because the mean of its divisors is an integer number (1941521400).

Almost surely, 2^66590967816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66590967816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93193027200).

66590967816 is an abundant number, since it is smaller than the sum of its proper divisors (119795086584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66590967816 is a wasteful number, since it uses less digits than its factorization.

66590967816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34939 (or 34932 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 66590967816 in words is "sixty-six billion, five hundred ninety million, nine hundred sixty-seven thousand, eight hundred sixteen".