18734765501861 has 2 divisors, whose sum is σ = 18734765501862. Its totient is φ = 18734765501860.

The previous prime is 18734765501807. The next prime is 18734765501869. The reversal of 18734765501861 is 16810556743781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13566190599361 + 5168574902500 = 3683231^2 + 2273450^2 .

It is a cyclic number.

It is not a de Polignac number, because 18734765501861 - 2⁶ = 18734765501797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18734765501794 and 18734765501803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18734765501869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367382750930 + 9367382750931.

It is an arithmetic number, because the mean of its divisors is an integer number (9367382750931).

Almost surely, 2^{18734765501861} is an apocalyptic number.

It is an amenable number.

18734765501861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18734765501861 is an equidigital number, since it uses as much as digits as its factorization.

18734765501861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33868800, while the sum is 62.

The spelling of 18734765501861 in words is "eighteen trillion, seven hundred thirty-four billion, seven hundred sixty-five million, five hundred one thousand, eight hundred sixty-one".