18649541917 has 2 divisors, whose sum is σ = 18649541918. Its totient is φ = 18649541916.

The previous prime is 18649541899. The next prime is 18649541983. The reversal of 18649541917 is 71914594681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15136134841 + 3513407076 = 123029^2 + 59274^2 .

It is a cyclic number.

It is not a de Polignac number, because 18649541917 - 2³¹ = 16502058269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18649541987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9324770958 + 9324770959.

It is an arithmetic number, because the mean of its divisors is an integer number (9324770959).

Almost surely, 2^18649541917 is an apocalyptic number.

It is an amenable number.

18649541917 is a deficient number, since it is larger than the sum of its proper divisors (1).

18649541917 is an equidigital number, since it uses as much as digits as its factorization.

18649541917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 55.

The spelling of 18649541917 in words is "eighteen billion, six hundred forty-nine million, five hundred forty-one thousand, nine hundred seventeen".