18387541801 has 2 divisors, whose sum is σ = 18387541802. Its totient is φ = 18387541800.

The previous prime is 18387541729. The next prime is 18387541891. The reversal of 18387541801 is 10814578381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15400810000 + 2986731801 = 124100^2 + 54651^2 .

It is a cyclic number.

It is not a de Polignac number, because 18387541801 - 2²³ = 18379153193 is a prime.

It is not a weakly prime, because it can be changed into another prime (18387541891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9193770900 + 9193770901.

It is an arithmetic number, because the mean of its divisors is an integer number (9193770901).

Almost surely, 2^18387541801 is an apocalyptic number.

It is an amenable number.

18387541801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18387541801 is an equidigital number, since it uses as much as digits as its factorization.

18387541801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 18387541801 in words is "eighteen billion, three hundred eighty-seven million, five hundred forty-one thousand, eight hundred one".