18215485633 has 2 divisors, whose sum is σ = 18215485634. Its totient is φ = 18215485632.

The previous prime is 18215485627. The next prime is 18215485681. The reversal of 18215485633 is 33658451281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12138971329 + 6076514304 = 110177^2 + 77952^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18215485633 is a prime.

It is not a weakly prime, because it can be changed into another prime (18215485693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107742816 + 9107742817.

It is an arithmetic number, because the mean of its divisors is an integer number (9107742817).

Almost surely, 2^18215485633 is an apocalyptic number.

It is an amenable number.

18215485633 is a deficient number, since it is larger than the sum of its proper divisors (1).

18215485633 is an equidigital number, since it uses as much as digits as its factorization.

18215485633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 46.

The spelling of 18215485633 in words is "eighteen billion, two hundred fifteen million, four hundred eighty-five thousand, six hundred thirty-three".