21166522016662 has 24 divisors (see below), whose sum is σ = 35237342479248. Its totient is φ = 9527737171920.

The previous prime is 21166522016657. The next prime is 21166522016669. The reversal of 21166522016662 is 26661022566112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166522016669) 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 11 ways as a sum of consecutive naturals, for example, 424562293 + ... + 424612144.

It is an arithmetic number, because the mean of its divisors is an integer number (1468222603302).

Almost surely, 2^{21166522016662} is an apocalyptic number.

21166522016662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21166522016662 is a deficient number, since it is larger than the sum of its proper divisors (14070820462586).

21166522016662 is a wasteful number, since it uses less digits than its factorization.

21166522016662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849174564 (or 849174553 counting only the distinct ones).

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

It can be divided in two parts, 2116652 and 2016662, that added together give a palindrome (4133314).

The spelling of 21166522016662 in words is "twenty-one trillion, one hundred sixty-six billion, five hundred twenty-two million, sixteen thousand, six hundred sixty-two".