18487647305 has 16 divisors (see below), whose sum is σ = 23506082064. Its totient is φ = 13910691840.

The previous prime is 18487647301. The next prime is 18487647317. The reversal of 18487647305 is 50374678481.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 49266361 + 18438380944 = 7019^2 + 135788^2 .

It is not a de Polignac number, because 18487647305 - 2² = 18487647301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18487647301) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 54065 + ... + 199745.

It is an arithmetic number, because the mean of its divisors is an integer number (1469130129).

Almost surely, 2^18487647305 is an apocalyptic number.

It is an amenable number.

18487647305 is a deficient number, since it is larger than the sum of its proper divisors (5018434759).

18487647305 is a wasteful number, since it uses less digits than its factorization.

18487647305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147196.

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 18487647305 in words is "eighteen billion, four hundred eighty-seven million, six hundred forty-seven thousand, three hundred five".