18989750069 has 2 divisors, whose sum is σ = 18989750070. Its totient is φ = 18989750068.

The previous prime is 18989750041. The next prime is 18989750071. The reversal of 18989750069 is 96005798981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17506729969 + 1483020100 = 132313^2 + 38510^2 .

It is a cyclic number.

It is not a de Polignac number, because 18989750069 - 2²⁴ = 18972972853 is a prime.

It is a super-2 number, since 2×18989750069² (a number of 21 digits) contains 22 as substring.

Together with 18989750071, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18989749993 and 18989750020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18989756069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9494875034 + 9494875035.

It is an arithmetic number, because the mean of its divisors is an integer number (9494875035).

Almost surely, 2^18989750069 is an apocalyptic number.

It is an amenable number.

18989750069 is a deficient number, since it is larger than the sum of its proper divisors (1).

18989750069 is an equidigital number, since it uses as much as digits as its factorization.

18989750069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 62.

The spelling of 18989750069 in words is "eighteen billion, nine hundred eighty-nine million, seven hundred fifty thousand, sixty-nine".