18129653887 has 2 divisors, whose sum is σ = 18129653888. Its totient is φ = 18129653886.

The previous prime is 18129653869. The next prime is 18129653897. The reversal of 18129653887 is 78835692181.

It is a strong prime.

It is an emirp because it is prime and its reverse (78835692181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18129653887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18129653897) 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, 9064826943 + 9064826944.

It is an arithmetic number, because the mean of its divisors is an integer number (9064826944).

Almost surely, 2^18129653887 is an apocalyptic number.

18129653887 is a deficient number, since it is larger than the sum of its proper divisors (1).

18129653887 is an equidigital number, since it uses as much as digits as its factorization.

18129653887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 58.

The spelling of 18129653887 in words is "eighteen billion, one hundred twenty-nine million, six hundred fifty-three thousand, eight hundred eighty-seven".