18868632997 has 2 divisors, whose sum is σ = 18868632998. Its totient is φ = 18868632996.

The previous prime is 18868632983. The next prime is 18868633009. The reversal of 18868632997 is 79923686881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14880584196 + 3988048801 = 121986^2 + 63151^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18868632997 is a prime.

It is a super-2 number, since 2×18868632997² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18868632947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434316498 + 9434316499.

It is an arithmetic number, because the mean of its divisors is an integer number (9434316499).

Almost surely, 2^18868632997 is an apocalyptic number.

It is an amenable number.

18868632997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868632997 is an equidigital number, since it uses as much as digits as its factorization.

18868632997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 67.

The spelling of 18868632997 in words is "eighteen billion, eight hundred sixty-eight million, six hundred thirty-two thousand, nine hundred ninety-seven".