66081805715200 has 108 divisors (see below), whose sum is σ = 178432139565288. Its totient is φ = 24029747507200.

The previous prime is 66081805715171. The next prime is 66081805715209. The reversal of 66081805715200 is 251750818066.

It is a super-2 number, since 2×66081805715200² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66081805715209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 469260607 + ... + 469401406.

Almost surely, 2^{66081805715200} is an apocalyptic number.

It is an amenable number.

66081805715200 is an abundant number, since it is smaller than the sum of its proper divisors (112350333850088).

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

66081805715200 is a wasteful number, since it uses less digits than its factorization.

66081805715200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938662050 (or 938662031 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 66081805715200 in words is "sixty-six trillion, eighty-one billion, eight hundred five million, seven hundred fifteen thousand, two hundred".