18454387816 has 8 divisors (see below), whose sum is σ = 34601977170. Its totient is φ = 9227193904.

The previous prime is 18454387753. The next prime is 18454387817. The reversal of 18454387816 is 61878345481.

It can be written as a sum of positive squares in only one way, i.e., 17985492100 + 468895716 = 134110^2 + 21654^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18454387817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1153399231 + ... + 1153399246.

Almost surely, 2^18454387816 is an apocalyptic number.

It is an amenable number.

18454387816 is a deficient number, since it is larger than the sum of its proper divisors (16147589354).

18454387816 is a wasteful number, since it uses less digits than its factorization.

18454387816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306798483 (or 2306798479 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 55.

The spelling of 18454387816 in words is "eighteen billion, four hundred fifty-four million, three hundred eighty-seven thousand, eight hundred sixteen".