18924061987 has 2 divisors, whose sum is σ = 18924061988. Its totient is φ = 18924061986.

The previous prime is 18924061963. The next prime is 18924062041. The reversal of 18924061987 is 78916042981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18924061987 - 2⁷ = 18924061859 is a prime.

It is not a weakly prime, because it can be changed into another prime (18924061907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9462030993 + 9462030994.

It is an arithmetic number, because the mean of its divisors is an integer number (9462030994).

Almost surely, 2^18924061987 is an apocalyptic number.

18924061987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18924061987 is an equidigital number, since it uses as much as digits as its factorization.

18924061987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 18924061987 in words is "eighteen billion, nine hundred twenty-four million, sixty-one thousand, nine hundred eighty-seven".