66303306720 has 144 divisors (see below), whose sum is σ = 258582935520. Its totient is φ = 15155039232.

The previous prime is 66303306703. The next prime is 66303306779. The reversal of 66303306720 is 2760330366.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×66303306720² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3278775 + ... + 3298934.

It is an arithmetic number, because the mean of its divisors is an integer number (1795714830).

Almost surely, 2^66303306720 is an apocalyptic number.

66303306720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66303306720 is an abundant number, since it is smaller than the sum of its proper divisors (192279628800).

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

66303306720 is a wasteful number, since it uses less digits than its factorization.

66303306720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6577737 (or 6577726 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 36.

The spelling of 66303306720 in words is "sixty-six billion, three hundred three million, three hundred six thousand, seven hundred twenty".