18180920441 has 2 divisors, whose sum is σ = 18180920442. Its totient is φ = 18180920440.

The previous prime is 18180920389. The next prime is 18180920449. The reversal of 18180920441 is 14402908181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15153610000 + 3027310441 = 123100^2 + 55021^2 .

It is a cyclic number.

It is not a de Polignac number, because 18180920441 - 2¹⁴ = 18180904057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18180920395 and 18180920404.

It is not a weakly prime, because it can be changed into another prime (18180920449) 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, 9090460220 + 9090460221.

It is an arithmetic number, because the mean of its divisors is an integer number (9090460221).

Almost surely, 2^18180920441 is an apocalyptic number.

It is an amenable number.

18180920441 is a deficient number, since it is larger than the sum of its proper divisors (1).

18180920441 is an equidigital number, since it uses as much as digits as its factorization.

18180920441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 38.

The spelling of 18180920441 in words is "eighteen billion, one hundred eighty million, nine hundred twenty thousand, four hundred forty-one".