18434439687 has 8 divisors (see below), whose sum is σ = 25102215936. Its totient is φ = 12028144952.

The previous prime is 18434439677. The next prime is 18434439707. The reversal of 18434439687 is 78693443481.

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

It is a cyclic number.

It is not a de Polignac number, because 18434439687 - 2⁸ = 18434439431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18434439677) 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, 65370213 + ... + 65370494.

It is an arithmetic number, because the mean of its divisors is an integer number (3137776992).

Almost surely, 2^18434439687 is an apocalyptic number.

18434439687 is a deficient number, since it is larger than the sum of its proper divisors (6667776249).

18434439687 is a wasteful number, since it uses less digits than its factorization.

18434439687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130740757.

The product of its digits is 13934592, while the sum is 57.

The spelling of 18434439687 in words is "eighteen billion, four hundred thirty-four million, four hundred thirty-nine thousand, six hundred eighty-seven".