66698746812 has 96 divisors (see below), whose sum is σ = 173727375360. Its totient is φ = 22129718400.

The previous prime is 66698746801. The next prime is 66698746949. The reversal of 66698746812 is 21864789666.

It is a self number, because there is not a number n which added to its sum of digits gives 66698746812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24858423 + ... + 24861105.

It is an arithmetic number, because the mean of its divisors is an integer number (1809660160).

Almost surely, 2^66698746812 is an apocalyptic number.

It is an amenable number.

66698746812 is an abundant number, since it is smaller than the sum of its proper divisors (107028628548).

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

66698746812 is a wasteful number, since it uses less digits than its factorization.

66698746812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3680 (or 3672 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 66698746812 in words is "sixty-six billion, six hundred ninety-eight million, seven hundred forty-six thousand, eight hundred twelve".