18478646354 has 16 divisors (see below), whose sum is σ = 31716758976. Its totient is φ = 7909650000.

The previous prime is 18478646341. The next prime is 18478646357. The reversal of 18478646354 is 45364687481.

It is a self number, because there is not a number n which added to its sum of digits gives 18478646354.

It is not an unprimeable number, because it can be changed into a prime (18478646357) 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, 802397 + ... + 825104.

It is an arithmetic number, because the mean of its divisors is an integer number (1982297436).

Almost surely, 2^18478646354 is an apocalyptic number.

18478646354 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18478646354 is a deficient number, since it is larger than the sum of its proper divisors (13238112622).

18478646354 is a wasteful number, since it uses less digits than its factorization.

18478646354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628321.

The product of its digits is 15482880, while the sum is 56.

The spelling of 18478646354 in words is "eighteen billion, four hundred seventy-eight million, six hundred forty-six thousand, three hundred fifty-four".