220131188561 has 2 divisors, whose sum is σ = 220131188562. Its totient is φ = 220131188560.

The previous prime is 220131188521. The next prime is 220131188587. The reversal of 220131188561 is 165881131022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114802380625 + 105328807936 = 338825^2 + 324544^2 .

It is a cyclic number.

It is not a de Polignac number, because 220131188561 - 2¹⁰ = 220131187537 is a prime.

It is not a weakly prime, because it can be changed into another prime (220131188521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110065594280 + 110065594281.

It is an arithmetic number, because the mean of its divisors is an integer number (110065594281).

Almost surely, 2^220131188561 is an apocalyptic number.

It is an amenable number.

220131188561 is a deficient number, since it is larger than the sum of its proper divisors (1).

220131188561 is an equidigital number, since it uses as much as digits as its factorization.

220131188561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 220131188561 in words is "two hundred twenty billion, one hundred thirty-one million, one hundred eighty-eight thousand, five hundred sixty-one".