18712415537 has 2 divisors, whose sum is σ = 18712415538. Its totient is φ = 18712415536.

The previous prime is 18712415459. The next prime is 18712415549. The reversal of 18712415537 is 73551421781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10121164816 + 8591250721 = 100604^2 + 92689^2 .

It is a cyclic number.

It is not a de Polignac number, because 18712415537 - 2¹⁶ = 18712350001 is a prime.

It is not a weakly prime, because it can be changed into another prime (18712415237) 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, 9356207768 + 9356207769.

It is an arithmetic number, because the mean of its divisors is an integer number (9356207769).

Almost surely, 2^18712415537 is an apocalyptic number.

It is an amenable number.

18712415537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18712415537 is an equidigital number, since it uses as much as digits as its factorization.

18712415537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 44.

The spelling of 18712415537 in words is "eighteen billion, seven hundred twelve million, four hundred fifteen thousand, five hundred thirty-seven".