18185429077 has 2 divisors, whose sum is σ = 18185429078. Its totient is φ = 18185429076.

The previous prime is 18185428973. The next prime is 18185429089. The reversal of 18185429077 is 77092458181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13207985476 + 4977443601 = 114926^2 + 70551^2 .

It is a cyclic number.

It is not a de Polignac number, because 18185429077 - 2¹⁹ = 18184904789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18185429677) 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, 9092714538 + 9092714539.

It is an arithmetic number, because the mean of its divisors is an integer number (9092714539).

Almost surely, 2^18185429077 is an apocalyptic number.

It is an amenable number.

18185429077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18185429077 is an equidigital number, since it uses as much as digits as its factorization.

18185429077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 18185429077 in words is "eighteen billion, one hundred eighty-five million, four hundred twenty-nine thousand, seventy-seven".