18447382516 has 24 divisors (see below), whose sum is σ = 34214632200. Its totient is φ = 8672812032.

The previous prime is 18447382501. The next prime is 18447382517. The reversal of 18447382516 is 61528374481.

It can be written as a sum of positive squares in 4 ways, for example, as 12498345616 + 5949036900 = 111796^2 + 77130^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18447382516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18447382517) 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 in 7 ways as a sum of consecutive naturals, for example, 57975 + ... + 200638.

It is an arithmetic number, because the mean of its divisors is an integer number (1425609675).

Almost surely, 2^18447382516 is an apocalyptic number.

It is an amenable number.

18447382516 is a deficient number, since it is larger than the sum of its proper divisors (15767249684).

18447382516 is a wasteful number, since it uses less digits than its factorization.

18447382516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259683 (or 259681 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

The spelling of 18447382516 in words is "eighteen billion, four hundred forty-seven million, three hundred eighty-two thousand, five hundred sixteen".