66998689092 has 36 divisors (see below), whose sum is σ = 169365845376. Its totient is φ = 22331835120.

The previous prime is 66998689061. The next prime is 66998689123. The reversal of 66998689092 is 29098689966.

It is an interprime number because it is at equal distance from previous prime (66998689061) and next prime (66998689123).

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66998689092.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1215433 + ... + 1269359.

It is an arithmetic number, because the mean of its divisors is an integer number (4704606816).

Almost surely, 2^66998689092 is an apocalyptic number.

It is an amenable number.

66998689092 is an abundant number, since it is smaller than the sum of its proper divisors (102367156284).

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

66998689092 is a wasteful number, since it uses less digits than its factorization.

66998689092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88448 (or 88443 counting only the distinct ones).

The product of its (nonzero) digits is 181398528, while the sum is 72.

The spelling of 66998689092 in words is "sixty-six billion, nine hundred ninety-eight million, six hundred eighty-nine thousand, ninety-two".