66910666992 has 80 divisors (see below), whose sum is σ = 186668052480. Its totient is φ = 20530480896.

The previous prime is 66910666981. The next prime is 66910667017. The reversal of 66910666992 is 29966601966.

66910666992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74673 + ... + 373359.

It is an arithmetic number, because the mean of its divisors is an integer number (2333350656).

Almost surely, 2^66910666992 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 66910666992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93334026240).

66910666992 is an abundant number, since it is smaller than the sum of its proper divisors (119757385488).

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

66910666992 is a wasteful number, since it uses less digits than its factorization.

66910666992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299070 (or 299064 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 60.

The spelling of 66910666992 in words is "sixty-six billion, nine hundred ten million, six hundred sixty-six thousand, nine hundred ninety-two".