866535497 has 2 divisors, whose sum is σ = 866535498. Its totient is φ = 866535496.

The previous prime is 866535493. The next prime is 866535517. The reversal of 866535497 is 794535668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 812307001 + 54228496 = 28501^2 + 7364^2 .

It is a cyclic number.

It is not a de Polignac number, because 866535497 - 2² = 866535493 is a prime.

It is a super-2 number, since 2×866535497² = 1501767535122074018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866535491) 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, 433267748 + 433267749.

It is an arithmetic number, because the mean of its divisors is an integer number (433267749).

Almost surely, 2^866535497 is an apocalyptic number.

It is an amenable number.

866535497 is a deficient number, since it is larger than the sum of its proper divisors (1).

866535497 is an equidigital number, since it uses as much as digits as its factorization.

866535497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 53.

The square root of 866535497 is about 29436.9749974416. The cubic root of 866535497 is about 953.3713996759.

The spelling of 866535497 in words is "eight hundred sixty-six million, five hundred thirty-five thousand, four hundred ninety-seven".