212646645 has 24 divisors (see below), whose sum is σ = 369454176. Its totient is φ = 113144928.

The previous prime is 212646607. The next prime is 212646673. The reversal of 212646645 is 546646212.

212646645 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 4 + 6 + 645 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-212646645 is a prime.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 14602 + ... + 25268.

It is an arithmetic number, because the mean of its divisors is an integer number (15393924).

Almost surely, 2^212646645 is an apocalyptic number.

It is an amenable number.

212646645 is a deficient number, since it is larger than the sum of its proper divisors (156807531).

212646645 is a wasteful number, since it uses less digits than its factorization.

212646645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11121 (or 11118 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 212646645 is about 14582.4087516432. The cubic root of 212646645 is about 596.8788336879.

The spelling of 212646645 in words is "two hundred twelve million, six hundred forty-six thousand, six hundred forty-five".