3518738375221 has 2 divisors, whose sum is σ = 3518738375222. Its totient is φ = 3518738375220.

The previous prime is 3518738375203. The next prime is 3518738375263. The reversal of 3518738375221 is 1225738378153.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3478933736100 + 39804639121 = 1865190^2 + 199511^2 .

It is a cyclic number.

It is not a de Polignac number, because 3518738375221 - 2¹⁵ = 3518738342453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3518738375021) 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 as a sum of consecutive naturals, namely, 1759369187610 + 1759369187611.

It is an arithmetic number, because the mean of its divisors is an integer number (1759369187611).

Almost surely, 2^{3518738375221} is an apocalyptic number.

It is an amenable number.

3518738375221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3518738375221 is an equidigital number, since it uses as much as digits as its factorization.

3518738375221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8467200, while the sum is 55.

The spelling of 3518738375221 in words is "three trillion, five hundred eighteen billion, seven hundred thirty-eight million, three hundred seventy-five thousand, two hundred twenty-one".