213516666 has 24 divisors (see below), whose sum is σ = 504676224. Its totient is φ = 64701960.

The previous prime is 213516637. The next prime is 213516673. The reversal of 213516666 is 666615312.

It is a self number, because there is not a number n which added to its sum of digits gives 213516666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 538986 + ... + 539381.

It is an arithmetic number, because the mean of its divisors is an integer number (21028176).

Almost surely, 2^213516666 is an apocalyptic number.

213516666 is an abundant number, since it is smaller than the sum of its proper divisors (291159558).

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

213516666 is a wasteful number, since it uses less digits than its factorization.

213516666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078386 (or 1078383 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 213516666 is about 14612.2094838529. The cubic root of 213516666 is about 597.6917480087.

The spelling of 213516666 in words is "two hundred thirteen million, five hundred sixteen thousand, six hundred sixty-six".