18476474674321 has 2 divisors, whose sum is σ = 18476474674322. Its totient is φ = 18476474674320.

The previous prime is 18476474674261. The next prime is 18476474674337. The reversal of 18476474674321 is 12347647467481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15866392093696 + 2610082580625 = 3983264^2 + 1615575^2 .

It is a cyclic number.

It is not a de Polignac number, because 18476474674321 - 2³¹ = 18474327190673 is a prime.

It is a super-2 number, since 2×18476474674321² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18476474674391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9238237337160 + 9238237337161.

It is an arithmetic number, because the mean of its divisors is an integer number (9238237337161).

Almost surely, 2^{18476474674321} is an apocalyptic number.

It is an amenable number.

18476474674321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18476474674321 is an equidigital number, since it uses as much as digits as its factorization.

18476474674321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151732224, while the sum is 64.

The spelling of 18476474674321 in words is "eighteen trillion, four hundred seventy-six billion, four hundred seventy-four million, six hundred seventy-four thousand, three hundred twenty-one".