18518501860477 has 2 divisors, whose sum is σ = 18518501860478. Its totient is φ = 18518501860476.

The previous prime is 18518501860367. The next prime is 18518501860531. The reversal of 18518501860477 is 77406810581581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17847971798596 + 670530061881 = 4224686^2 + 818859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18518501860477 is a prime.

It is a super-2 number, since 2×18518501860477² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18518501860577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259250930238 + 9259250930239.

It is an arithmetic number, because the mean of its divisors is an integer number (9259250930239).

Almost surely, 2^{18518501860477} is an apocalyptic number.

It is an amenable number.

18518501860477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18518501860477 is an equidigital number, since it uses as much as digits as its factorization.

18518501860477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15052800, while the sum is 61.

The spelling of 18518501860477 in words is "eighteen trillion, five hundred eighteen billion, five hundred one million, eight hundred sixty thousand, four hundred seventy-seven".