97665511 has 2 divisors, whose sum is σ = 97665512. Its totient is φ = 97665510.

The previous prime is 97665499. The next prime is 97665539. The reversal of 97665511 is 11556679.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97665511 - 2⁵ = 97665479 is a prime.

It is a super-2 number, since 2×97665511² = 19077104077782242, which contains 22 as substring.

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 (97665551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48832755 + 48832756.

It is an arithmetic number, because the mean of its divisors is an integer number (48832756).

Almost surely, 2^97665511 is an apocalyptic number.

97665511 is a deficient number, since it is larger than the sum of its proper divisors (1).

97665511 is an equidigital number, since it uses as much as digits as its factorization.

97665511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 40.

The square root of 97665511 is about 9882.5862505723. The cubic root of 97665511 is about 460.5184938046.

The spelling of 97665511 in words is "ninety-seven million, six hundred sixty-five thousand, five hundred eleven".