18605666351 has 2 divisors, whose sum is σ = 18605666352. Its totient is φ = 18605666350.

The previous prime is 18605666347. The next prime is 18605666399. The reversal of 18605666351 is 15366650681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18605666351 - 2² = 18605666347 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 18605666296 and 18605666305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18605666341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9302833175 + 9302833176.

It is an arithmetic number, because the mean of its divisors is an integer number (9302833176).

Almost surely, 2^18605666351 is an apocalyptic number.

18605666351 is a deficient number, since it is larger than the sum of its proper divisors (1).

18605666351 is an equidigital number, since it uses as much as digits as its factorization.

18605666351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 18605666351 in words is "eighteen billion, six hundred five million, six hundred sixty-six thousand, three hundred fifty-one".