18015606047 has 2 divisors, whose sum is σ = 18015606048. Its totient is φ = 18015606046.

The previous prime is 18015606043. The next prime is 18015606071. The reversal of 18015606047 is 74060651081.

It is a weak prime.

It is an emirp because it is prime and its reverse (74060651081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18015606047 - 2² = 18015606043 is a prime.

It is a super-2 number, since 2×18015606047² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18015606047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18015606041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9007803023 + 9007803024.

It is an arithmetic number, because the mean of its divisors is an integer number (9007803024).

Almost surely, 2^18015606047 is an apocalyptic number.

18015606047 is a deficient number, since it is larger than the sum of its proper divisors (1).

18015606047 is an equidigital number, since it uses as much as digits as its factorization.

18015606047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 18015606047 in words is "eighteen billion, fifteen million, six hundred six thousand, forty-seven".