18861508387 has 8 divisors (see below), whose sum is σ = 19091293200. Its totient is φ = 18631784160.

The previous prime is 18861508277. The next prime is 18861508399. The reversal of 18861508387 is 78380516881.

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-18861508387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18861500387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1166337 + ... + 1182397.

It is an arithmetic number, because the mean of its divisors is an integer number (2386411650).

Almost surely, 2^18861508387 is an apocalyptic number.

18861508387 is a deficient number, since it is larger than the sum of its proper divisors (229784813).

18861508387 is a wasteful number, since it uses less digits than its factorization.

18861508387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30293.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 18861508387 in words is "eighteen billion, eight hundred sixty-one million, five hundred eight thousand, three hundred eighty-seven".