19800711181 has 2 divisors, whose sum is σ = 19800711182. Its totient is φ = 19800711180.

The previous prime is 19800711131. The next prime is 19800711239. The reversal of 19800711181 is 18111700891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13610955556 + 6189755625 = 116666^2 + 78675^2 .

It is a cyclic number.

It is not a de Polignac number, because 19800711181 - 2⁹ = 19800710669 is a prime.

It is a super-2 number, since 2×19800711181² (a number of 21 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 19800711181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19800711131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9900355590 + 9900355591.

It is an arithmetic number, because the mean of its divisors is an integer number (9900355591).

Almost surely, 2^19800711181 is an apocalyptic number.

It is an amenable number.

19800711181 is a deficient number, since it is larger than the sum of its proper divisors (1).

19800711181 is an equidigital number, since it uses as much as digits as its factorization.

19800711181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 37.

The spelling of 19800711181 in words is "nineteen billion, eight hundred million, seven hundred eleven thousand, one hundred eighty-one".