6665166737 has 2 divisors, whose sum is σ = 6665166738. Its totient is φ = 6665166736.

The previous prime is 6665166719. The next prime is 6665166793. The reversal of 6665166737 is 7376615666.

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., 5231484241 + 1433682496 = 72329^2 + 37864^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665166737 - 2¹⁰ = 6665165713 is a prime.

It is a super-2 number, since 2×6665166737² = 88848895264022454338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6665166707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332583368 + 3332583369.

It is an arithmetic number, because the mean of its divisors is an integer number (3332583369).

Almost surely, 2^6665166737 is an apocalyptic number.

It is an amenable number.

6665166737 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665166737 is an equidigital number, since it uses as much as digits as its factorization.

6665166737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 53.

The square root of 6665166737 is about 81640.4724202402. The cubic root of 6665166737 is about 1881.9308983894.

Subtracting 6665166737 from its reverse (7376615666), we obtain a square (711448929 = 26673²).

The spelling of 6665166737 in words is "six billion, six hundred sixty-five million, one hundred sixty-six thousand, seven hundred thirty-seven".