18803539889 has 2 divisors, whose sum is σ = 18803539890. Its totient is φ = 18803539888.

The previous prime is 18803539879. The next prime is 18803539901. The reversal of 18803539889 is 98893530881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18308254864 + 495285025 = 135308^2 + 22255^2 .

It is a cyclic number.

It is not a de Polignac number, because 18803539889 - 2¹⁶ = 18803474353 is a prime.

It is a super-2 number, since 2×18803539889² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18803539879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9401769944 + 9401769945.

It is an arithmetic number, because the mean of its divisors is an integer number (9401769945).

Almost surely, 2^18803539889 is an apocalyptic number.

It is an amenable number.

18803539889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18803539889 is an equidigital number, since it uses as much as digits as its factorization.

18803539889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 62.

The spelling of 18803539889 in words is "eighteen billion, eight hundred three million, five hundred thirty-nine thousand, eight hundred eighty-nine".