97666537 has 2 divisors, whose sum is σ = 97666538. Its totient is φ = 97666536.

The previous prime is 97666529. The next prime is 97666549. The reversal of 97666537 is 73566679.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64304361 + 33362176 = 8019^2 + 5776^2 .

It is a cyclic number.

It is not a de Polignac number, because 97666537 - 2³ = 97666529 is a prime.

It is a super-3 number, since 3×97666537³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (97666567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48833268 + 48833269.

It is an arithmetic number, because the mean of its divisors is an integer number (48833269).

Almost surely, 2^97666537 is an apocalyptic number.

It is an amenable number.

97666537 is a deficient number, since it is larger than the sum of its proper divisors (1).

97666537 is an equidigital number, since it uses as much as digits as its factorization.

97666537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 49.

The square root of 97666537 is about 9882.6381599247. The cubic root of 97666537 is about 460.5201064186.

The spelling of 97666537 in words is "ninety-seven million, six hundred sixty-six thousand, five hundred thirty-seven".