212650666 has 4 divisors (see below), whose sum is σ = 318976002. Its totient is φ = 106325332.

The previous prime is 212650643. The next prime is 212650673. The reversal of 212650666 is 666056212.

212650666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 162027441 + 50623225 = 12729^2 + 7115^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53162665 + ... + 53162668.

Almost surely, 2^212650666 is an apocalyptic number.

212650666 is a deficient number, since it is larger than the sum of its proper divisors (106325336).

212650666 is a wasteful number, since it uses less digits than its factorization.

212650666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106325335.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 212650666 is about 14582.5466225896. The cubic root of 212650666 is about 596.8825958519.

The spelling of 212650666 in words is "two hundred twelve million, six hundred fifty thousand, six hundred sixty-six".