18707613481 has 2 divisors, whose sum is σ = 18707613482. Its totient is φ = 18707613480.

The previous prime is 18707613479. The next prime is 18707613487. The reversal of 18707613481 is 18431670781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18701930025 + 5683456 = 136755^2 + 2384^2 .

It is a cyclic number.

It is not a de Polignac number, because 18707613481 - 2¹ = 18707613479 is a prime.

It is a super-2 number, since 2×18707613481² (a number of 21 digits) contains 22 as substring.

Together with 18707613479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18707613487) 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, 9353806740 + 9353806741.

It is an arithmetic number, because the mean of its divisors is an integer number (9353806741).

Almost surely, 2^18707613481 is an apocalyptic number.

It is an amenable number.

18707613481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18707613481 is an equidigital number, since it uses as much as digits as its factorization.

18707613481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 18707613481 in words is "eighteen billion, seven hundred seven million, six hundred thirteen thousand, four hundred eighty-one".