212775725666 has 32 divisors (see below), whose sum is σ = 379018444800. Its totient is φ = 87663546000.

The previous prime is 212775725647. The next prime is 212775725671. The reversal of 212775725666 is 666527577212.

212775725666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212775725666² (a number of 23 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 1557866 + ... + 1688933.

It is an arithmetic number, because the mean of its divisors is an integer number (11844326400).

Almost surely, 2^212775725666 is an apocalyptic number.

212775725666 is a deficient number, since it is larger than the sum of its proper divisors (166242719134).

212775725666 is a wasteful number, since it uses less digits than its factorization.

212775725666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246990.

The product of its digits is 14817600, while the sum is 56.

The spelling of 212775725666 in words is "two hundred twelve billion, seven hundred seventy-five million, seven hundred twenty-five thousand, six hundred sixty-six".