18387864371 has 2 divisors, whose sum is σ = 18387864372. Its totient is φ = 18387864370.

The previous prime is 18387864353. The next prime is 18387864373. The reversal of 18387864371 is 17346878381.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18387864371 - 2⁶ = 18387864307 is a prime.

It is a super-2 number, since 2×18387864371² (a number of 21 digits) contains 22 as substring.

Together with 18387864373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18387864373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9193932185 + 9193932186.

It is an arithmetic number, because the mean of its divisors is an integer number (9193932186).

Almost surely, 2^18387864371 is an apocalyptic number.

18387864371 is a deficient number, since it is larger than the sum of its proper divisors (1).

18387864371 is an equidigital number, since it uses as much as digits as its factorization.

18387864371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5419008, while the sum is 56.

The spelling of 18387864371 in words is "eighteen billion, three hundred eighty-seven million, eight hundred sixty-four thousand, three hundred seventy-one".