220666826461 has 4 divisors (see below), whose sum is σ = 220667808924. Its totient is φ = 220665844000.

The previous prime is 220666826407. The next prime is 220666826473. The reversal of 220666826461 is 164628666022.

220666826461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 121866620836 + 98800205625 = 349094^2 + 314325^2 .

It is a cyclic number.

It is not a de Polignac number, because 220666826461 - 2²⁵ = 220633272029 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220666826491) 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 3 ways as a sum of consecutive naturals, for example, 30111 + ... + 665011.

It is an arithmetic number, because the mean of its divisors is an integer number (55166952231).

Almost surely, 2^220666826461 is an apocalyptic number.

It is an amenable number.

220666826461 is a deficient number, since it is larger than the sum of its proper divisors (982463).

220666826461 is an equidigital number, since it uses as much as digits as its factorization.

220666826461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982462.

The product of its (nonzero) digits is 1990656, while the sum is 49.

The spelling of 220666826461 in words is "two hundred twenty billion, six hundred sixty-six million, eight hundred twenty-six thousand, four hundred sixty-one".