18712077841 has 2 divisors, whose sum is σ = 18712077842. Its totient is φ = 18712077840.

The previous prime is 18712077833. The next prime is 18712077911. The reversal of 18712077841 is 14877021781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16398083025 + 2313994816 = 128055^2 + 48104^2 .

It is an emirp because it is prime and its reverse (14877021781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18712077841 - 2³ = 18712077833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18712077791 and 18712077800.

It is not a weakly prime, because it can be changed into another prime (18712077941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9356038920 + 9356038921.

It is an arithmetic number, because the mean of its divisors is an integer number (9356038921).

Almost surely, 2^18712077841 is an apocalyptic number.

It is an amenable number.

18712077841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18712077841 is an equidigital number, since it uses as much as digits as its factorization.

18712077841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 175616, while the sum is 46.

The spelling of 18712077841 in words is "eighteen billion, seven hundred twelve million, seventy-seven thousand, eight hundred forty-one".