18016983091477 has 4 divisors (see below), whose sum is σ = 18017449251340. Its totient is φ = 18016516931616.

The previous prime is 18016983091469. The next prime is 18016983091567. The reversal of 18016983091477 is 77419038961081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10274114766276 + 7742868325201 = 3205326^2 + 2782601^2 .

It is a cyclic number.

It is not a de Polignac number, because 18016983091477 - 2³ = 18016983091469 is a prime.

It is a super-2 number, since 2×18016983091477² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18016983091777) 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 3 ways as a sum of consecutive naturals, for example, 233021952 + ... + 233099257.

It is an arithmetic number, because the mean of its divisors is an integer number (4504362312835).

Almost surely, 2^{18016983091477} is an apocalyptic number.

It is an amenable number.

18016983091477 is a deficient number, since it is larger than the sum of its proper divisors (466159863).

18016983091477 is an equidigital number, since it uses as much as digits as its factorization.

18016983091477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466159862.

The product of its (nonzero) digits is 18289152, while the sum is 64.

The spelling of 18016983091477 in words is "eighteen trillion, sixteen billion, nine hundred eighty-three million, ninety-one thousand, four hundred seventy-seven".