212720518766 has 8 divisors (see below), whose sum is σ = 364663746480. Its totient is φ = 91165936608.

The previous prime is 212720518741. The next prime is 212720518793. The reversal of 212720518766 is 667815027212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212720518766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7597161371 + ... + 7597161398.

It is an arithmetic number, because the mean of its divisors is an integer number (45582968310).

Almost surely, 2^212720518766 is an apocalyptic number.

212720518766 is a deficient number, since it is larger than the sum of its proper divisors (151943227714).

212720518766 is a wasteful number, since it uses less digits than its factorization.

212720518766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15194322778.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 212720518766 in words is "two hundred twelve billion, seven hundred twenty million, five hundred eighteen thousand, seven hundred sixty-six".