18010778801 has 2 divisors, whose sum is σ = 18010778802. Its totient is φ = 18010778800.

The previous prime is 18010778771. The next prime is 18010778833. The reversal of 18010778801 is 10887701081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14670054400 + 3340724401 = 121120^2 + 57799^2 .

It is a cyclic number.

It is not a de Polignac number, because 18010778801 - 2¹⁰ = 18010777777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18010778881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9005389400 + 9005389401.

It is an arithmetic number, because the mean of its divisors is an integer number (9005389401).

Almost surely, 2^18010778801 is an apocalyptic number.

It is an amenable number.

18010778801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18010778801 is an equidigital number, since it uses as much as digits as its factorization.

18010778801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25088, while the sum is 41.

The spelling of 18010778801 in words is "eighteen billion, ten million, seven hundred seventy-eight thousand, eight hundred one".