18288869381 has 2 divisors, whose sum is σ = 18288869382. Its totient is φ = 18288869380.

The previous prime is 18288869377. The next prime is 18288869419. The reversal of 18288869381 is 18396888281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18222300100 + 66569281 = 134990^2 + 8159^2 .

It is a cyclic number.

It is not a de Polignac number, because 18288869381 - 2² = 18288869377 is a prime.

It is a super-2 number, since 2×18288869381² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18288869351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9144434690 + 9144434691.

It is an arithmetic number, because the mean of its divisors is an integer number (9144434691).

Almost surely, 2^18288869381 is an apocalyptic number.

It is an amenable number.

18288869381 is a deficient number, since it is larger than the sum of its proper divisors (1).

18288869381 is an equidigital number, since it uses as much as digits as its factorization.

18288869381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10616832, while the sum is 62.

The spelling of 18288869381 in words is "eighteen billion, two hundred eighty-eight million, eight hundred sixty-nine thousand, three hundred eighty-one".