212656645 has 8 divisors (see below), whose sum is σ = 268619040. Its totient is φ = 161171280.

The previous prime is 212656601. The next prime is 212656651. The reversal of 212656645 is 546656212.

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

It is not a de Polignac number, because 212656645 - 2⁹ = 212656133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1119151 + ... + 1119340.

It is an arithmetic number, because the mean of its divisors is an integer number (33577380).

Almost surely, 2^212656645 is an apocalyptic number.

It is an amenable number.

212656645 is a deficient number, since it is larger than the sum of its proper divisors (55962395).

212656645 is a wasteful number, since it uses less digits than its factorization.

212656645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238515.

The product of its digits is 86400, while the sum is 37.

The square root of 212656645 is about 14582.7516264935. The cubic root of 212656645 is about 596.8881898897. Note that the first 3 decimals are identical.

The spelling of 212656645 in words is "two hundred twelve million, six hundred fifty-six thousand, six hundred forty-five".