16185478481 has 2 divisors, whose sum is σ = 16185478482. Its totient is φ = 16185478480.

The previous prime is 16185478427. The next prime is 16185478487. The reversal of 16185478481 is 18487458161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9219072256 + 6966406225 = 96016^2 + 83465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16185478481 is a prime.

It is a super-2 number, since 2×16185478481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16185478487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8092739240 + 8092739241.

It is an arithmetic number, because the mean of its divisors is an integer number (8092739241).

Almost surely, 2^16185478481 is an apocalyptic number.

It is an amenable number.

16185478481 is a deficient number, since it is larger than the sum of its proper divisors (1).

16185478481 is an equidigital number, since it uses as much as digits as its factorization.

16185478481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1720320, while the sum is 53.

The spelling of 16185478481 in words is "sixteen billion, one hundred eighty-five million, four hundred seventy-eight thousand, four hundred eighty-one".