13166506649 has 2 divisors, whose sum is σ = 13166506650. Its totient is φ = 13166506648.

The previous prime is 13166506621. The next prime is 13166506657. The reversal of 13166506649 is 94660566131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7814560000 + 5351946649 = 88400^2 + 73157^2 .

It is a cyclic number.

It is not a de Polignac number, because 13166506649 - 2⁸ = 13166506393 is a prime.

It is a super-2 number, since 2×13166506649² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13166506679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6583253324 + 6583253325.

It is an arithmetic number, because the mean of its divisors is an integer number (6583253325).

Almost surely, 2^13166506649 is an apocalyptic number.

It is an amenable number.

13166506649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13166506649 is an equidigital number, since it uses as much as digits as its factorization.

13166506649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 47.

The spelling of 13166506649 in words is "thirteen billion, one hundred sixty-six million, five hundred six thousand, six hundred forty-nine".