18987999463 has 2 divisors, whose sum is σ = 18987999464. Its totient is φ = 18987999462.

The previous prime is 18987999461. The next prime is 18987999599. The reversal of 18987999463 is 36499978981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18987999463 - 2¹ = 18987999461 is a prime.

Together with 18987999461, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18987999461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9493999731 + 9493999732.

It is an arithmetic number, because the mean of its divisors is an integer number (9493999732).

Almost surely, 2^18987999463 is an apocalyptic number.

18987999463 is a deficient number, since it is larger than the sum of its proper divisors (1).

18987999463 is an equidigital number, since it uses as much as digits as its factorization.

18987999463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211631616, while the sum is 73.

The spelling of 18987999463 in words is "eighteen billion, nine hundred eighty-seven million, nine hundred ninety-nine thousand, four hundred sixty-three".