213465665 has 32 divisors (see below), whose sum is σ = 318816000. Its totient is φ = 133878528.

The previous prime is 213465661. The next prime is 213465671. The reversal of 213465665 is 566564312.

It is a happy number.

It is not a de Polignac number, because 213465665 - 2² = 213465661 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213465661) 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 31 ways as a sum of consecutive naturals, for example, 13751 + ... + 24819.

It is an arithmetic number, because the mean of its divisors is an integer number (9963000).

Almost surely, 2^213465665 is an apocalyptic number.

It is an amenable number.

213465665 is a deficient number, since it is larger than the sum of its proper divisors (105350335).

213465665 is a wasteful number, since it uses less digits than its factorization.

213465665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11129.

The product of its digits is 129600, while the sum is 38.

The square root of 213465665 is about 14610.4642294487. The cubic root of 213465665 is about 597.6441556204.

The spelling of 213465665 in words is "two hundred thirteen million, four hundred sixty-five thousand, six hundred sixty-five".