66212750766 has 64 divisors (see below), whose sum is σ = 138769053696. Its totient is φ = 21037363200.

The previous prime is 66212750753. The next prime is 66212750777. The reversal of 66212750766 is 66705721266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3798166 + ... + 3815558.

It is an arithmetic number, because the mean of its divisors is an integer number (2168266464).

Almost surely, 2^66212750766 is an apocalyptic number.

66212750766 is an abundant number, since it is smaller than the sum of its proper divisors (72556302930).

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

66212750766 is a wasteful number, since it uses less digits than its factorization.

66212750766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17737.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 66212750766 in words is "sixty-six billion, two hundred twelve million, seven hundred fifty thousand, seven hundred sixty-six".