18378228241 has 2 divisors, whose sum is σ = 18378228242. Its totient is φ = 18378228240.

The previous prime is 18378228163. The next prime is 18378228307. The reversal of 18378228241 is 14282287381.

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., 17129312641 + 1248915600 = 130879^2 + 35340^2 .

It is a cyclic number.

It is not a de Polignac number, because 18378228241 - 2²¹ = 18376131089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18378228191 and 18378228200.

It is not a weakly prime, because it can be changed into another prime (18378229241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9189114120 + 9189114121.

It is an arithmetic number, because the mean of its divisors is an integer number (9189114121).

Almost surely, 2^18378228241 is an apocalyptic number.

It is an amenable number.

18378228241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18378228241 is an equidigital number, since it uses as much as digits as its factorization.

18378228241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 344064, while the sum is 46.

The spelling of 18378228241 in words is "eighteen billion, three hundred seventy-eight million, two hundred twenty-eight thousand, two hundred forty-one".