18518501860577 has 2 divisors, whose sum is σ = 18518501860578. Its totient is φ = 18518501860576.

The previous prime is 18518501860541. The next prime is 18518501860751. The reversal of 18518501860577 is 77506810581581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18023837211601 + 494664648976 = 4245449^2 + 703324^2 .

It is an emirp because it is prime and its reverse (77506810581581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18518501860577 - 2¹⁰ = 18518501859553 is a prime.

It is a super-2 number, since 2×18518501860577² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18518501860477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259250930288 + 9259250930289.

It is an arithmetic number, because the mean of its divisors is an integer number (9259250930289).

Almost surely, 2^{18518501860577} is an apocalyptic number.

It is an amenable number.

18518501860577 is a deficient number, since it is larger than the sum of its proper divisors (1).

18518501860577 is an equidigital number, since it uses as much as digits as its factorization.

18518501860577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816000, while the sum is 62.

The spelling of 18518501860577 in words is "eighteen trillion, five hundred eighteen billion, five hundred one million, eight hundred sixty thousand, five hundred seventy-seven".