97666729 has 2 divisors, whose sum is σ = 97666730. Its totient is φ = 97666728.

The previous prime is 97666727. The next prime is 97666733. The reversal of 97666729 is 92766679.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91776400 + 5890329 = 9580^2 + 2427^2 .

It is a cyclic number.

It is not a de Polignac number, because 97666729 - 2¹ = 97666727 is a prime.

Together with 97666727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (97666727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48833364 + 48833365.

It is an arithmetic number, because the mean of its divisors is an integer number (48833365).

Almost surely, 2^97666729 is an apocalyptic number.

It is an amenable number.

97666729 is a deficient number, since it is larger than the sum of its proper divisors (1).

97666729 is an equidigital number, since it uses as much as digits as its factorization.

97666729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 52.

The square root of 97666729 is about 9882.6478739253. The cubic root of 97666729 is about 460.5204081931.

The spelling of 97666729 in words is "ninety-seven million, six hundred sixty-six thousand, seven hundred twenty-nine".