213620666 has 16 divisors (see below), whose sum is σ = 366405120. Its totient is φ = 91502160.

The previous prime is 213620663. The next prime is 213620677. The reversal of 213620666 is 666026312.

It is not an unprimeable number, because it can be changed into a prime (213620663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36311 + ... + 41781.

It is an arithmetic number, because the mean of its divisors is an integer number (22900320).

Almost surely, 2^213620666 is an apocalyptic number.

213620666 is a deficient number, since it is larger than the sum of its proper divisors (152784454).

213620666 is a wasteful number, since it uses less digits than its factorization.

213620666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8269.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 213620666 is about 14615.7677184608. The cubic root of 213620666 is about 597.7887737715.

Adding to 213620666 its reverse (666026312), we get a palindrome (879646978).

The spelling of 213620666 in words is "two hundred thirteen million, six hundred twenty thousand, six hundred sixty-six".