18168267049 has 2 divisors, whose sum is σ = 18168267050. Its totient is φ = 18168267048.

The previous prime is 18168267017. The next prime is 18168267059. The reversal of 18168267049 is 94076286181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16546191424 + 1622075625 = 128632^2 + 40275^2 .

It is a cyclic number.

It is not a de Polignac number, because 18168267049 - 2⁵ = 18168267017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18168266987 and 18168267005.

It is not a weakly prime, because it can be changed into another prime (18168267059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084133524 + 9084133525.

It is an arithmetic number, because the mean of its divisors is an integer number (9084133525).

Almost surely, 2^18168267049 is an apocalyptic number.

It is an amenable number.

18168267049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168267049 is an equidigital number, since it uses as much as digits as its factorization.

18168267049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 18168267049 in words is "eighteen billion, one hundred sixty-eight million, two hundred sixty-seven thousand, forty-nine".