18781481455 has 32 divisors (see below), whose sum is σ = 24819402816. Its totient is φ = 13642992000.

The previous prime is 18781481441. The next prime is 18781481461. The reversal of 18781481455 is 55418418781.

It is a happy number.

It is not a de Polignac number, because 18781481455 - 2¹⁷ = 18781350383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 10786885 + ... + 10788625.

It is an arithmetic number, because the mean of its divisors is an integer number (775606338).

Almost surely, 2^18781481455 is an apocalyptic number.

18781481455 is a deficient number, since it is larger than the sum of its proper divisors (6037921361).

18781481455 is a wasteful number, since it uses less digits than its factorization.

18781481455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400 (or 3378 counting only the distinct ones).

The product of its digits is 1433600, while the sum is 52.

The spelling of 18781481455 in words is "eighteen billion, seven hundred eighty-one million, four hundred eighty-one thousand, four hundred fifty-five".