18179761289449 has 2 divisors, whose sum is σ = 18179761289450. Its totient is φ = 18179761289448.

The previous prime is 18179761289413. The next prime is 18179761289467. The reversal of 18179761289449 is 94498216797181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16137148649449 + 2042612640000 = 4017107^2 + 1429200^2 .

It is a cyclic number.

It is not a de Polignac number, because 18179761289449 - 2⁷ = 18179761289321 is a prime.

It is not a weakly prime, because it can be changed into another prime (18179761289749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9089880644724 + 9089880644725.

It is an arithmetic number, because the mean of its divisors is an integer number (9089880644725).

Almost surely, 2^{18179761289449} is an apocalyptic number.

It is an amenable number.

18179761289449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18179761289449 is an equidigital number, since it uses as much as digits as its factorization.

18179761289449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 438939648, while the sum is 76.

The spelling of 18179761289449 in words is "eighteen trillion, one hundred seventy-nine billion, seven hundred sixty-one million, two hundred eighty-nine thousand, four hundred forty-nine".