18478643554 has 8 divisors (see below), whose sum is σ = 31677674688. Its totient is φ = 7919418660.

The previous prime is 18478643507. The next prime is 18478643569. The reversal of 18478643554 is 45534687481.

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

It is a junction number, because it is equal to n+sod(n) for n = 18478643495 and 18478643504.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 659951542 + ... + 659951569.

It is an arithmetic number, because the mean of its divisors is an integer number (3959709336).

Almost surely, 2^18478643554 is an apocalyptic number.

18478643554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18478643554 is a deficient number, since it is larger than the sum of its proper divisors (13199031134).

18478643554 is a wasteful number, since it uses less digits than its factorization.

18478643554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319903120.

The product of its digits is 12902400, while the sum is 55.

The spelling of 18478643554 in words is "eighteen billion, four hundred seventy-eight million, six hundred forty-three thousand, five hundred fifty-four".