18916836181487 has 2 divisors, whose sum is σ = 18916836181488. Its totient is φ = 18916836181486.

The previous prime is 18916836181421. The next prime is 18916836181493. The reversal of 18916836181487 is 78418163861981.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78418163861981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18916836181487 - 2¹² = 18916836177391 is a prime.

It is a super-2 number, since 2×18916836181487² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18916836181487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18916836151487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458418090743 + 9458418090744.

It is an arithmetic number, because the mean of its divisors is an integer number (9458418090744).

Almost surely, 2^{18916836181487} is an apocalyptic number.

18916836181487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18916836181487 is an equidigital number, since it uses as much as digits as its factorization.

18916836181487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111476736, while the sum is 71.

The spelling of 18916836181487 in words is "eighteen trillion, nine hundred sixteen billion, eight hundred thirty-six million, one hundred eighty-one thousand, four hundred eighty-seven".