18087915866 has 8 divisors (see below), whose sum is σ = 27133952340. Its totient is φ = 9043265088.

The previous prime is 18087915863. The next prime is 18087915869. The reversal of 18087915866 is 66851978081.

It is an interprime number because it is at equal distance from previous prime (18087915863) and next prime (18087915869).

It can be written as a sum of positive squares in 2 ways, for example, as 10481459641 + 7606456225 = 102379^2 + 87215^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18087915863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313151 + ... + 366386.

Almost surely, 2^18087915866 is an apocalyptic number.

18087915866 is a deficient number, since it is larger than the sum of its proper divisors (9046036474).

18087915866 is a wasteful number, since it uses less digits than its factorization.

18087915866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692848.

The product of its (nonzero) digits is 5806080, while the sum is 59.

The spelling of 18087915866 in words is "eighteen billion, eighty-seven million, nine hundred fifteen thousand, eight hundred sixty-six".