866040247 has 2 divisors, whose sum is σ = 866040248. Its totient is φ = 866040246.

The previous prime is 866040209. The next prime is 866040251. The reversal of 866040247 is 742040668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866040247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866040257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433020123 + 433020124.

It is an arithmetic number, because the mean of its divisors is an integer number (433020124).

Almost surely, 2^866040247 is an apocalyptic number.

866040247 is a deficient number, since it is larger than the sum of its proper divisors (1).

866040247 is an equidigital number, since it uses as much as digits as its factorization.

866040247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 866040247 is about 29428.5617555463. The cubic root of 866040247 is about 953.1897386567.

The spelling of 866040247 in words is "eight hundred sixty-six million, forty thousand, two hundred forty-seven".