18701123620813 has 2 divisors, whose sum is σ = 18701123620814. Its totient is φ = 18701123620812.

The previous prime is 18701123620789. The next prime is 18701123620871. The reversal of 18701123620813 is 31802632110781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18701101323529 + 22297284 = 4324477^2 + 4722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18701123620813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18701123620813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18701123620013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350561810406 + 9350561810407.

It is an arithmetic number, because the mean of its divisors is an integer number (9350561810407).

Almost surely, 2^{18701123620813} is an apocalyptic number.

It is an amenable number.

18701123620813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18701123620813 is an equidigital number, since it uses as much as digits as its factorization.

18701123620813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 18701123620813 in words is "eighteen trillion, seven hundred one billion, one hundred twenty-three million, six hundred twenty thousand, eight hundred thirteen".