18521750437 has 2 divisors, whose sum is σ = 18521750438. Its totient is φ = 18521750436.

The previous prime is 18521750381. The next prime is 18521750447. The reversal of 18521750437 is 73405712581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16090668801 + 2431081636 = 126849^2 + 49306^2 .

It is a cyclic number.

It is not a de Polignac number, because 18521750437 - 2⁷ = 18521750309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18521750393 and 18521750402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18521750447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9260875218 + 9260875219.

It is an arithmetic number, because the mean of its divisors is an integer number (9260875219).

Almost surely, 2^18521750437 is an apocalyptic number.

It is an amenable number.

18521750437 is a deficient number, since it is larger than the sum of its proper divisors (1).

18521750437 is an equidigital number, since it uses as much as digits as its factorization.

18521750437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 18521750437 in words is "eighteen billion, five hundred twenty-one million, seven hundred fifty thousand, four hundred thirty-seven".