18201520049 has 2 divisors, whose sum is σ = 18201520050. Its totient is φ = 18201520048.

The previous prime is 18201520039. The next prime is 18201520069. The reversal of 18201520049 is 94002510281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15825640000 + 2375880049 = 125800^2 + 48743^2 .

It is an emirp because it is prime and its reverse (94002510281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18201520049 - 2⁸ = 18201519793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18201519997 and 18201520024.

It is not a weakly prime, because it can be changed into another prime (18201520039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9100760024 + 9100760025.

It is an arithmetic number, because the mean of its divisors is an integer number (9100760025).

Almost surely, 2^18201520049 is an apocalyptic number.

It is an amenable number.

18201520049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18201520049 is an equidigital number, since it uses as much as digits as its factorization.

18201520049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 18201520049 in words is "eighteen billion, two hundred one million, five hundred twenty thousand, forty-nine".