18747223317613 has 12 divisors (see below), whose sum is σ = 21810503651580. Its totient is φ = 16067199688512.

The previous prime is 18747223317611. The next prime is 18747223317637. The reversal of 18747223317613 is 31671332274781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6559325409924 + 12187897907689 = 2561118^2 + 3491117^2 .

It is not a de Polignac number, because 18747223317613 - 2¹ = 18747223317611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18747223317611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21580048 + ... + 22431961.

It is an arithmetic number, because the mean of its divisors is an integer number (1817541970965).

Almost surely, 2^{18747223317613} is an apocalyptic number.

It is an amenable number.

18747223317613 is a deficient number, since it is larger than the sum of its proper divisors (3063280333967).

18747223317613 is an equidigital number, since it uses as much as digits as its factorization.

18747223317613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44020716 (or 44020709 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 55.

The spelling of 18747223317613 in words is "eighteen trillion, seven hundred forty-seven billion, two hundred twenty-three million, three hundred seventeen thousand, six hundred thirteen".