18235961449 has 2 divisors, whose sum is σ = 18235961450. Its totient is φ = 18235961448.

The previous prime is 18235961399. The next prime is 18235961459. The reversal of 18235961449 is 94416953281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13009683600 + 5226277849 = 114060^2 + 72293^2 .

It is a cyclic number.

It is not a de Polignac number, because 18235961449 - 2⁷ = 18235961321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18235961396 and 18235961405.

It is not a weakly prime, because it can be changed into another prime (18235961459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9117980724 + 9117980725.

It is an arithmetic number, because the mean of its divisors is an integer number (9117980725).

Almost surely, 2^18235961449 is an apocalyptic number.

It is an amenable number.

18235961449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18235961449 is an equidigital number, since it uses as much as digits as its factorization.

18235961449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 52.

The spelling of 18235961449 in words is "eighteen billion, two hundred thirty-five million, nine hundred sixty-one thousand, four hundred forty-nine".