201213686566 has 16 divisors (see below), whose sum is σ = 303782201280. Its totient is φ = 99953118720.

The previous prime is 201213686563. The next prime is 201213686579. The reversal of 201213686566 is 665686312102.

201213686566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×201213686566² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201213686563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2676195 + ... + 2750353.

It is an arithmetic number, because the mean of its divisors is an integer number (18986387580).

Almost surely, 2^201213686566 is an apocalyptic number.

201213686566 is a deficient number, since it is larger than the sum of its proper divisors (102568514714).

201213686566 is a wasteful number, since it uses less digits than its factorization.

201213686566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82959.

The product of its (nonzero) digits is 622080, while the sum is 46.

Adding to 201213686566 its reverse (665686312102), we get a palindrome (866899998668).

The spelling of 201213686566 in words is "two hundred one billion, two hundred thirteen million, six hundred eighty-six thousand, five hundred sixty-six".