18400937909771 has 2 divisors, whose sum is σ = 18400937909772. Its totient is φ = 18400937909770.

The previous prime is 18400937909759. The next prime is 18400937909779. The reversal of 18400937909771 is 17790973900481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18400937909771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18400937909698 and 18400937909707.

It is not a weakly prime, because it can be changed into another prime (18400937909779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9200468954885 + 9200468954886.

It is an arithmetic number, because the mean of its divisors is an integer number (9200468954886).

Almost surely, 2^{18400937909771} is an apocalyptic number.

18400937909771 is a deficient number, since it is larger than the sum of its proper divisors (1).

18400937909771 is an equidigital number, since it uses as much as digits as its factorization.

18400937909771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24004512, while the sum is 65.

The spelling of 18400937909771 in words is "eighteen trillion, four hundred billion, nine hundred thirty-seven million, nine hundred nine thousand, seven hundred seventy-one".