97665551 has 2 divisors, whose sum is σ = 97665552. Its totient is φ = 97665550.

The previous prime is 97665539. The next prime is 97665563. The reversal of 97665551 is 15556679.

It is a balanced prime because it is at equal distance from previous prime (97665539) and next prime (97665563).

It is a cyclic number.

It is not a de Polignac number, because 97665551 - 2²² = 93471247 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97665511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48832775 + 48832776.

It is an arithmetic number, because the mean of its divisors is an integer number (48832776).

Almost surely, 2^97665551 is an apocalyptic number.

97665551 is a deficient number, since it is larger than the sum of its proper divisors (1).

97665551 is an equidigital number, since it uses as much as digits as its factorization.

97665551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 283500, while the sum is 44.

The square root of 97665551 is about 9882.5882743338. The cubic root of 97665551 is about 460.5185566748.

The spelling of 97665551 in words is "ninety-seven million, six hundred sixty-five thousand, five hundred fifty-one".