18628664017 has 2 divisors, whose sum is σ = 18628664018. Its totient is φ = 18628664016.

The previous prime is 18628664009. The next prime is 18628664069. The reversal of 18628664017 is 71046682681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9831912336 + 8796751681 = 99156^2 + 93791^2 .

It is a cyclic number.

It is not a de Polignac number, because 18628664017 - 2³ = 18628664009 is a prime.

It is not a weakly prime, because it can be changed into another prime (18628664917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9314332008 + 9314332009.

It is an arithmetic number, because the mean of its divisors is an integer number (9314332009).

Almost surely, 2^18628664017 is an apocalyptic number.

It is an amenable number.

18628664017 is a deficient number, since it is larger than the sum of its proper divisors (1).

18628664017 is an equidigital number, since it uses as much as digits as its factorization.

18628664017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 18628664017 in words is "eighteen billion, six hundred twenty-eight million, six hundred sixty-four thousand, seventeen".