66356772700 has 36 divisors (see below), whose sum is σ = 144027812880. Its totient is φ = 26536512640.

The previous prime is 66356772659. The next prime is 66356772719. The reversal of 66356772700 is 727765366.

It is a happy number.

It is a congruent number.

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, 365649 + ... + 516151.

It is an arithmetic number, because the mean of its divisors is an integer number (4000772580).

Almost surely, 2^66356772700 is an apocalyptic number.

It is an amenable number.

66356772700 is an abundant number, since it is smaller than the sum of its proper divisors (77671040180).

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

66356772700 is a wasteful number, since it uses less digits than its factorization.

66356772700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154926 (or 154919 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 49.

It can be divided in two parts, 66356 and 772700, that added together give a square (839056 = 916²).

The spelling of 66356772700 in words is "sixty-six billion, three hundred fifty-six million, seven hundred seventy-two thousand, seven hundred".