66923971600 has 120 divisors (see below), whose sum is σ = 161885754720. Its totient is φ = 26587008000.

The previous prime is 66923971537. The next prime is 66923971679. The reversal of 66923971600 is 617932966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42598815 + ... + 42600385.

It is an arithmetic number, because the mean of its divisors is an integer number (1349047956).

Almost surely, 2^66923971600 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 66923971600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80942877360).

66923971600 is an abundant number, since it is smaller than the sum of its proper divisors (94961783120).

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

66923971600 is a wasteful number, since it uses less digits than its factorization.

66923971600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249 (or 2238 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 66923971600 in words is "sixty-six billion, nine hundred twenty-three million, nine hundred seventy-one thousand, six hundred".