18042687487 has 16 divisors (see below), whose sum is σ = 20504309760. Its totient is φ = 15727672800.

The previous prime is 18042687463. The next prime is 18042687493. The reversal of 18042687487 is 78478624081.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18042687487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18042685487) 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 in 15 ways as a sum of consecutive naturals, for example, 205543 + ... + 279880.

It is an arithmetic number, because the mean of its divisors is an integer number (1281519360).

Almost surely, 2^18042687487 is an apocalyptic number.

18042687487 is a deficient number, since it is larger than the sum of its proper divisors (2461622273).

18042687487 is a wasteful number, since it uses less digits than its factorization.

18042687487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485574.

The product of its (nonzero) digits is 4816896, while the sum is 55.

The spelling of 18042687487 in words is "eighteen billion, forty-two million, six hundred eighty-seven thousand, four hundred eighty-seven".