2666518249 has 2 divisors, whose sum is σ = 2666518250. Its totient is φ = 2666518248.

The previous prime is 2666518243. The next prime is 2666518297. The reversal of 2666518249 is 9428156662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2591522649 + 74995600 = 50907^2 + 8660^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666518249 - 2²⁹ = 2129647337 is a prime.

It is a super-2 number, since 2×2666518249² = 14220639144500052002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2666518243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333259124 + 1333259125.

It is an arithmetic number, because the mean of its divisors is an integer number (1333259125).

Almost surely, 2^2666518249 is an apocalyptic number.

It is an amenable number.

2666518249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666518249 is an equidigital number, since it uses as much as digits as its factorization.

2666518249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The square root of 2666518249 is about 51638.3408815582. The cubic root of 2666518249 is about 1386.6968214583.

The spelling of 2666518249 in words is "two billion, six hundred sixty-six million, five hundred eighteen thousand, two hundred forty-nine".