866139900607 has 2 divisors, whose sum is σ = 866139900608. Its totient is φ = 866139900606.

The previous prime is 866139900547. The next prime is 866139900631. The reversal of 866139900607 is 706009931668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866139900607 - 2¹⁵ = 866139867839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866139900107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433069950303 + 433069950304.

It is an arithmetic number, because the mean of its divisors is an integer number (433069950304).

Almost surely, 2^866139900607 is an apocalyptic number.

866139900607 is a deficient number, since it is larger than the sum of its proper divisors (1).

866139900607 is an equidigital number, since it uses as much as digits as its factorization.

866139900607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 866139900607 in words is "eight hundred sixty-six billion, one hundred thirty-nine million, nine hundred thousand, six hundred seven".