18559641979 has 2 divisors, whose sum is σ = 18559641980. Its totient is φ = 18559641978.

The previous prime is 18559641973. The next prime is 18559642007. The reversal of 18559641979 is 97914695581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18559641979 - 2¹³ = 18559633787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18559641979.

It is not a weakly prime, because it can be changed into another prime (18559641973) 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, 9279820989 + 9279820990.

It is an arithmetic number, because the mean of its divisors is an integer number (9279820990).

Almost surely, 2^18559641979 is an apocalyptic number.

18559641979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18559641979 is an equidigital number, since it uses as much as digits as its factorization.

18559641979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24494400, while the sum is 64.

The spelling of 18559641979 in words is "eighteen billion, five hundred fifty-nine million, six hundred forty-one thousand, nine hundred seventy-nine".