18403681801 has 2 divisors, whose sum is σ = 18403681802. Its totient is φ = 18403681800.

The previous prime is 18403681741. The next prime is 18403681811. The reversal of 18403681801 is 10818630481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9312250000 + 9091431801 = 96500^2 + 95349^2 .

It is a cyclic number.

It is not a de Polignac number, because 18403681801 - 2¹¹ = 18403679753 is a prime.

It is not a weakly prime, because it can be changed into another prime (18403681811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9201840900 + 9201840901.

It is an arithmetic number, because the mean of its divisors is an integer number (9201840901).

Almost surely, 2^18403681801 is an apocalyptic number.

It is an amenable number.

18403681801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18403681801 is an equidigital number, since it uses as much as digits as its factorization.

18403681801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 40.

The spelling of 18403681801 in words is "eighteen billion, four hundred three million, six hundred eighty-one thousand, eight hundred one".