18352213549 has 2 divisors, whose sum is σ = 18352213550. Its totient is φ = 18352213548.

The previous prime is 18352213493. The next prime is 18352213573. The reversal of 18352213549 is 94531225381.

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., 18095092324 + 257121225 = 134518^2 + 16035^2 .

It is a cyclic number.

It is not a de Polignac number, because 18352213549 - 2¹⁷ = 18352082477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18352213589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9176106774 + 9176106775.

It is an arithmetic number, because the mean of its divisors is an integer number (9176106775).

Almost surely, 2^18352213549 is an apocalyptic number.

It is an amenable number.

18352213549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18352213549 is an equidigital number, since it uses as much as digits as its factorization.

18352213549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 43.

The spelling of 18352213549 in words is "eighteen billion, three hundred fifty-two million, two hundred thirteen thousand, five hundred forty-nine".