213002666 has 8 divisors (see below), whose sum is σ = 319653540. Its totient is φ = 106451488.

The previous prime is 213002663. The next prime is 213002681. The reversal of 213002666 is 666200312.

It can be written as a sum of positive squares in 2 ways, for example, as 206525641 + 6477025 = 14371^2 + 2545^2 .

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

It is not an unprimeable number, because it can be changed into a prime (213002663) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 19331 + ... + 28278.

Almost surely, 2^213002666 is an apocalyptic number.

213002666 is a deficient number, since it is larger than the sum of its proper divisors (106650874).

213002666 is a wasteful number, since it uses less digits than its factorization.

213002666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49848.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 213002666 is about 14594.6108546956. The cubic root of 213002666 is about 597.2117536153.

Adding to 213002666 its reverse (666200312), we get a palindrome (879202978).

The spelling of 213002666 in words is "two hundred thirteen million, two thousand, six hundred sixty-six".