22031686181 has 2 divisors, whose sum is σ = 22031686182. Its totient is φ = 22031686180.

The previous prime is 22031686153. The next prime is 22031686199. The reversal of 22031686181 is 18168613022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20439277156 + 1592409025 = 142966^2 + 39905^2 .

It is a cyclic number.

It is not a de Polignac number, because 22031686181 - 2¹⁰ = 22031685157 is a prime.

It is a super-2 number, since 2×22031686181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22031686111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11015843090 + 11015843091.

It is an arithmetic number, because the mean of its divisors is an integer number (11015843091).

Almost surely, 2^22031686181 is an apocalyptic number.

It is an amenable number.

22031686181 is a deficient number, since it is larger than the sum of its proper divisors (1).

22031686181 is an equidigital number, since it uses as much as digits as its factorization.

22031686181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 22031686181 in words is "twenty-two billion, thirty-one million, six hundred eighty-six thousand, one hundred eighty-one".