18581148637 has 2 divisors, whose sum is σ = 18581148638. Its totient is φ = 18581148636.

The previous prime is 18581148583. The next prime is 18581148689. The reversal of 18581148637 is 73684118581.

It is an a-pointer prime, because the next prime (18581148689) can be obtained adding 18581148637 to its sum of digits (52).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11189619961 + 7391528676 = 105781^2 + 85974^2 .

It is a cyclic number.

It is not a de Polignac number, because 18581148637 - 2¹¹ = 18581146589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18581148037) 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, 9290574318 + 9290574319.

It is an arithmetic number, because the mean of its divisors is an integer number (9290574319).

Almost surely, 2^18581148637 is an apocalyptic number.

It is an amenable number.

18581148637 is a deficient number, since it is larger than the sum of its proper divisors (1).

18581148637 is an equidigital number, since it uses as much as digits as its factorization.

18581148637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 52.

The spelling of 18581148637 in words is "eighteen billion, five hundred eighty-one million, one hundred forty-eight thousand, six hundred thirty-seven".