866545399 has 2 divisors, whose sum is σ = 866545400. Its totient is φ = 866545398.

The previous prime is 866545367. The next prime is 866545411. The reversal of 866545399 is 993545668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866545399 - 2⁵ = 866545367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866545319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433272699 + 433272700.

It is an arithmetic number, because the mean of its divisors is an integer number (433272700).

Almost surely, 2^866545399 is an apocalyptic number.

866545399 is a deficient number, since it is larger than the sum of its proper divisors (1).

866545399 is an equidigital number, since it uses as much as digits as its factorization.

866545399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 55.

The square root of 866545399 is about 29437.1431867972. The cubic root of 866545399 is about 953.3750310900.

The spelling of 866545399 in words is "eight hundred sixty-six million, five hundred forty-five thousand, three hundred ninety-nine".