18579691061 has 2 divisors, whose sum is σ = 18579691062. Its totient is φ = 18579691060.

The previous prime is 18579691043. The next prime is 18579691073. The reversal of 18579691061 is 16019697581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17455430161 + 1124260900 = 132119^2 + 33530^2 .

It is an emirp because it is prime and its reverse (16019697581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18579691061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18579690994 and 18579691012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18579690061) 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, 9289845530 + 9289845531.

It is an arithmetic number, because the mean of its divisors is an integer number (9289845531).

Almost surely, 2^18579691061 is an apocalyptic number.

It is an amenable number.

18579691061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18579691061 is an equidigital number, since it uses as much as digits as its factorization.

18579691061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 18579691061 in words is "eighteen billion, five hundred seventy-nine million, six hundred ninety-one thousand, sixty-one".