211146666 has 8 divisors (see below), whose sum is σ = 422293344. Its totient is φ = 70382220.

The previous prime is 211146653. The next prime is 211146671. The reversal of 211146666 is 666641112.

It is a happy number.

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

211146666 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17595550 + ... + 17595561.

It is an arithmetic number, because the mean of its divisors is an integer number (52786668).

Almost surely, 2^211146666 is an apocalyptic number.

211146666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211146666 is a wasteful number, since it uses less digits than its factorization.

211146666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35191116.

The product of its digits is 10368, while the sum is 33.

The square root of 211146666 is about 14530.8866212630. The cubic root of 211146666 is about 595.4720882016.

Adding to 211146666 its reverse (666641112), we get a palindrome (877787778).

The spelling of 211146666 in words is "two hundred eleven million, one hundred forty-six thousand, six hundred sixty-six".