18986128943479 has 8 divisors (see below), whose sum is σ = 19003779599328. Its totient is φ = 18968483938080.

The previous prime is 18986128943473. The next prime is 18986128943539. The reversal of 18986128943479 is 97434982168981.

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 18986128943479 - 2¹¹ = 18986128941431 is a prime.

It is a super-2 number, since 2×18986128943479² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18986128943399 and 18986128943408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18986128943473) 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, 5325654 + ... + 8144620.

It is an arithmetic number, because the mean of its divisors is an integer number (2375472449916).

Almost surely, 2^{18986128943479} is an apocalyptic number.

18986128943479 is a deficient number, since it is larger than the sum of its proper divisors (17650655849).

18986128943479 is a wasteful number, since it uses less digits than its factorization.

18986128943479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825225.

The product of its digits is 1504935936, while the sum is 79.

The spelling of 18986128943479 in words is "eighteen trillion, nine hundred eighty-six billion, one hundred twenty-eight million, nine hundred forty-three thousand, four hundred seventy-nine".