18969608089 has 2 divisors, whose sum is σ = 18969608090. Its totient is φ = 18969608088.

The previous prime is 18969608057. The next prime is 18969608143. The reversal of 18969608089 is 98080696981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12753862489 + 6215745600 = 112933^2 + 78840^2 .

It is a cyclic number.

It is not a de Polignac number, because 18969608089 - 2⁵ = 18969608057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18969608089.

It is not a weakly prime, because it can be changed into another prime (18969608029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9484804044 + 9484804045.

It is an arithmetic number, because the mean of its divisors is an integer number (9484804045).

Almost surely, 2^18969608089 is an apocalyptic number.

It is an amenable number.

18969608089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18969608089 is an equidigital number, since it uses as much as digits as its factorization.

18969608089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13436928, while the sum is 64.

The spelling of 18969608089 in words is "eighteen billion, nine hundred sixty-nine million, six hundred eight thousand, eighty-nine".