18501853537 has 2 divisors, whose sum is σ = 18501853538. Its totient is φ = 18501853536.

The previous prime is 18501853529. The next prime is 18501853541. The reversal of 18501853537 is 73535810581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17615660176 + 886193361 = 132724^2 + 29769^2 .

It is a cyclic number.

It is not a de Polignac number, because 18501853537 - 2³ = 18501853529 is a prime.

It is not a weakly prime, because it can be changed into another prime (18501853547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9250926768 + 9250926769.

It is an arithmetic number, because the mean of its divisors is an integer number (9250926769).

Almost surely, 2^18501853537 is an apocalyptic number.

It is an amenable number.

18501853537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18501853537 is an equidigital number, since it uses as much as digits as its factorization.

18501853537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 18501853537 in words is "eighteen billion, five hundred one million, eight hundred fifty-three thousand, five hundred thirty-seven".