220188731909 has 2 divisors, whose sum is σ = 220188731910. Its totient is φ = 220188731908.

The previous prime is 220188731891. The next prime is 220188731929. The reversal of 220188731909 is 909137881022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124218887809 + 95969844100 = 352447^2 + 309790^2 .

It is a cyclic number.

It is not a de Polignac number, because 220188731909 - 2³⁶ = 151469255173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220188731929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110094365954 + 110094365955.

It is an arithmetic number, because the mean of its divisors is an integer number (110094365955).

Almost surely, 2^220188731909 is an apocalyptic number.

It is an amenable number.

220188731909 is a deficient number, since it is larger than the sum of its proper divisors (1).

220188731909 is an equidigital number, since it uses as much as digits as its factorization.

220188731909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 220188731909 in words is "two hundred twenty billion, one hundred eighty-eight million, seven hundred thirty-one thousand, nine hundred nine".