18659748677 has 2 divisors, whose sum is σ = 18659748678. Its totient is φ = 18659748676.

The previous prime is 18659748617. The next prime is 18659748689. The reversal of 18659748677 is 77684795681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18249037921 + 410710756 = 135089^2 + 20266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18659748677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18659748617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9329874338 + 9329874339.

It is an arithmetic number, because the mean of its divisors is an integer number (9329874339).

Almost surely, 2^18659748677 is an apocalyptic number.

It is an amenable number.

18659748677 is a deficient number, since it is larger than the sum of its proper divisors (1).

18659748677 is an equidigital number, since it uses as much as digits as its factorization.

18659748677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142248960, while the sum is 68.

The spelling of 18659748677 in words is "eighteen billion, six hundred fifty-nine million, seven hundred forty-eight thousand, six hundred seventy-seven".