213456651666635 has 16 divisors (see below), whose sum is σ = 275862027233856. Its totient is φ = 157623610635648.

The previous prime is 213456651666491. The next prime is 213456651666637. The reversal of 213456651666635 is 536666156654312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 213456651666635 - 2¹⁰ = 213456651665611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213456651666637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59887424 + ... + 63351533.

It is an arithmetic number, because the mean of its divisors is an integer number (17241376702116).

Almost surely, 2^{213456651666635} is an apocalyptic number.

213456651666635 is a deficient number, since it is larger than the sum of its proper divisors (62405375567221).

213456651666635 is a wasteful number, since it uses less digits than its factorization.

213456651666635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123265622.

The product of its digits is 419904000, while the sum is 65.

The spelling of 213456651666635 in words is "two hundred thirteen trillion, four hundred fifty-six billion, six hundred fifty-one million, six hundred sixty-six thousand, six hundred thirty-five".