18040449751633 has 2 divisors, whose sum is σ = 18040449751634. Its totient is φ = 18040449751632.

The previous prime is 18040449751627. The next prime is 18040449751657. The reversal of 18040449751633 is 33615794404081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17340503341249 + 699946410384 = 4164193^2 + 836628^2 .

It is a cyclic number.

It is not a de Polignac number, because 18040449751633 - 2⁵ = 18040449751601 is a prime.

It is not a weakly prime, because it can be changed into another prime (18040449751603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9020224875816 + 9020224875817.

It is an arithmetic number, because the mean of its divisors is an integer number (9020224875817).

Almost surely, 2^{18040449751633} is an apocalyptic number.

It is an amenable number.

18040449751633 is a deficient number, since it is larger than the sum of its proper divisors (1).

18040449751633 is an equidigital number, since it uses as much as digits as its factorization.

18040449751633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 18040449751633 in words is "eighteen trillion, forty billion, four hundred forty-nine million, seven hundred fifty-one thousand, six hundred thirty-three".