66591440700 has 144 divisors (see below), whose sum is σ = 195804801024. Its totient is φ = 17469619200.

The previous prime is 66591440689. The next prime is 66591440717. The reversal of 66591440700 is 704419566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19636005 + ... + 19639395.

Almost surely, 2^66591440700 is an apocalyptic number.

66591440700 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66591440700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97902400512).

66591440700 is an abundant number, since it is smaller than the sum of its proper divisors (129213360324).

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

66591440700 is a wasteful number, since it uses less digits than its factorization.

66591440700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452 (or 4445 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 66591440700 in words is "sixty-six billion, five hundred ninety-one million, four hundred forty thousand, seven hundred".