18378359969 has 2 divisors, whose sum is σ = 18378359970. Its totient is φ = 18378359968.

The previous prime is 18378359941. The next prime is 18378360001. The reversal of 18378359969 is 96995387381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10204030225 + 8174329744 = 101015^2 + 90412^2 .

It is a cyclic number.

It is not a de Polignac number, because 18378359969 - 2¹⁶ = 18378294433 is a prime.

It is a super-2 number, since 2×18378359969² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18378359899 and 18378359908.

It is not a weakly prime, because it can be changed into another prime (18378359939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9189179984 + 9189179985.

It is an arithmetic number, because the mean of its divisors is an integer number (9189179985).

Almost surely, 2^18378359969 is an apocalyptic number.

It is an amenable number.

18378359969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18378359969 is an equidigital number, since it uses as much as digits as its factorization.

18378359969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88179840, while the sum is 68.

The spelling of 18378359969 in words is "eighteen billion, three hundred seventy-eight million, three hundred fifty-nine thousand, nine hundred sixty-nine".