18420901049 has 2 divisors, whose sum is σ = 18420901050. Its totient is φ = 18420901048.

The previous prime is 18420901027. The next prime is 18420901073. The reversal of 18420901049 is 94010902481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17271216400 + 1149684649 = 131420^2 + 33907^2 .

It is a cyclic number.

It is not a de Polignac number, because 18420901049 - 2¹² = 18420896953 is a prime.

It is not a weakly prime, because it can be changed into another prime (18420901349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9210450524 + 9210450525.

It is an arithmetic number, because the mean of its divisors is an integer number (9210450525).

Almost surely, 2^18420901049 is an apocalyptic number.

It is an amenable number.

18420901049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18420901049 is an equidigital number, since it uses as much as digits as its factorization.

18420901049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 18420901049 in words is "eighteen billion, four hundred twenty million, nine hundred one thousand, forty-nine".