18316601647 has 2 divisors, whose sum is σ = 18316601648. Its totient is φ = 18316601646.

The previous prime is 18316601617. The next prime is 18316601671. The reversal of 18316601647 is 74610661381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18316601647 - 2⁷ = 18316601519 is a prime.

It is a super-2 number, since 2×18316601647² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18316601617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158300823 + 9158300824.

It is an arithmetic number, because the mean of its divisors is an integer number (9158300824).

Almost surely, 2^18316601647 is an apocalyptic number.

18316601647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18316601647 is an equidigital number, since it uses as much as digits as its factorization.

18316601647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 18316601647 in words is "eighteen billion, three hundred sixteen million, six hundred one thousand, six hundred forty-seven".