181838363869 has 2 divisors, whose sum is σ = 181838363870. Its totient is φ = 181838363868.

The previous prime is 181838363809. The next prime is 181838363887. The reversal of 181838363869 is 968363838181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170702838244 + 11135525625 = 413162^2 + 105525^2 .

It is a cyclic number.

It is not a de Polignac number, because 181838363869 - 2³⁵ = 147478625501 is a prime.

It is a super-2 number, since 2×181838363869² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181838363869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181838363809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90919181934 + 90919181935.

It is an arithmetic number, because the mean of its divisors is an integer number (90919181935).

Almost surely, 2^181838363869 is an apocalyptic number.

It is an amenable number.

181838363869 is a deficient number, since it is larger than the sum of its proper divisors (1).

181838363869 is an equidigital number, since it uses as much as digits as its factorization.

181838363869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35831808, while the sum is 64.

The spelling of 181838363869 in words is "one hundred eighty-one billion, eight hundred thirty-eight million, three hundred sixty-three thousand, eight hundred sixty-nine".