66732120517800 has 48 divisors (see below), whose sum is σ = 206869573607040. Its totient is φ = 17795232137920.

The previous prime is 66732120517787. The next prime is 66732120517841. The reversal of 66732120517800 is 871502123766.

It is a self number, because there is not a number n which added to its sum of digits gives 66732120517800.

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, 55610099832 + ... + 55610101031.

It is an arithmetic number, because the mean of its divisors is an integer number (4309782783480).

Almost surely, 2^{66732120517800} is an apocalyptic number.

66732120517800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66732120517800 is an abundant number, since it is smaller than the sum of its proper divisors (140137453089240).

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

66732120517800 is a wasteful number, since it uses less digits than its factorization.

66732120517800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111220200882 (or 111220200873 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 66732120517800 in words is "sixty-six trillion, seven hundred thirty-two billion, one hundred twenty million, five hundred seventeen thousand, eight hundred".