866495501 has 2 divisors, whose sum is σ = 866495502. Its totient is φ = 866495500.

The previous prime is 866495459. The next prime is 866495507. The reversal of 866495501 is 105594668.

866495501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661261225 + 205234276 = 25715^2 + 14326^2 .

It is a cyclic number.

It is not a de Polignac number, because 866495501 - 2²² = 862301197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866495507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433247750 + 433247751.

It is an arithmetic number, because the mean of its divisors is an integer number (433247751).

Almost surely, 2^866495501 is an apocalyptic number.

It is an amenable number.

866495501 is a deficient number, since it is larger than the sum of its proper divisors (1).

866495501 is an equidigital number, since it uses as much as digits as its factorization.

866495501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 866495501 is about 29436.2956399069. The cubic root of 866495501 is about 953.3567314447.

The spelling of 866495501 in words is "eight hundred sixty-six million, four hundred ninety-five thousand, five hundred one".