18185428973 has 2 divisors, whose sum is σ = 18185428974. Its totient is φ = 18185428972.

The previous prime is 18185428967. The next prime is 18185429077. The reversal of 18185428973 is 37982458181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16900780009 + 1284648964 = 130003^2 + 35842^2 .

It is a cyclic number.

It is not a de Polignac number, because 18185428973 - 2¹² = 18185424877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18185028973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9092714486 + 9092714487.

It is an arithmetic number, because the mean of its divisors is an integer number (9092714487).

Almost surely, 2^18185428973 is an apocalyptic number.

It is an amenable number.

18185428973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18185428973 is an equidigital number, since it uses as much as digits as its factorization.

18185428973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 56.

The spelling of 18185428973 in words is "eighteen billion, one hundred eighty-five million, four hundred twenty-eight thousand, nine hundred seventy-three".