18534200987 has 8 divisors (see below), whose sum is σ = 19095185136. Its totient is φ = 17976377952.

The previous prime is 18534200977. The next prime is 18534201011. The reversal of 18534200987 is 78900243581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18534200987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18534200977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 778373 + ... + 801830.

It is an arithmetic number, because the mean of its divisors is an integer number (2386898142).

Almost surely, 2^18534200987 is an apocalyptic number.

18534200987 is a deficient number, since it is larger than the sum of its proper divisors (560984149).

18534200987 is a wasteful number, since it uses less digits than its factorization.

18534200987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580557.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 18534200987 in words is "eighteen billion, five hundred thirty-four million, two hundred thousand, nine hundred eighty-seven".