18579690989 has 2 divisors, whose sum is σ = 18579690990. Its totient is φ = 18579690988.

The previous prime is 18579690959. The next prime is 18579691033. The reversal of 18579690989 is 98909697581.

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., 13244557225 + 5335133764 = 115085^2 + 73042^2 .

It is a cyclic number.

It is not a de Polignac number, because 18579690989 - 2¹² = 18579686893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18579690959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9289845494 + 9289845495.

It is an arithmetic number, because the mean of its divisors is an integer number (9289845495).

Almost surely, 2^18579690989 is an apocalyptic number.

It is an amenable number.

18579690989 is a deficient number, since it is larger than the sum of its proper divisors (1).

18579690989 is an equidigital number, since it uses as much as digits as its factorization.

18579690989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88179840, while the sum is 71.

The spelling of 18579690989 in words is "eighteen billion, five hundred seventy-nine million, six hundred ninety thousand, nine hundred eighty-nine".