17866145149 has 2 divisors, whose sum is σ = 17866145150. Its totient is φ = 17866145148.

The previous prime is 17866145131. The next prime is 17866145177. The reversal of 17866145149 is 94154166871.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12162119524 + 5704025625 = 110282^2 + 75525^2 .

It is a cyclic number.

It is not a de Polignac number, because 17866145149 - 2¹⁷ = 17866014077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17866145096 and 17866145105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17866145749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8933072574 + 8933072575.

It is an arithmetic number, because the mean of its divisors is an integer number (8933072575).

Almost surely, 2^17866145149 is an apocalyptic number.

It is an amenable number.

17866145149 is a deficient number, since it is larger than the sum of its proper divisors (1).

17866145149 is an equidigital number, since it uses as much as digits as its factorization.

17866145149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 52.

The spelling of 17866145149 in words is "seventeen billion, eight hundred sixty-six million, one hundred forty-five thousand, one hundred forty-nine".