866939525135423 has 2 divisors, whose sum is σ = 866939525135424. Its totient is φ = 866939525135422.

The previous prime is 866939525135417. The next prime is 866939525135491. The reversal of 866939525135423 is 324531525939668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866939525135423 - 2⁴ = 866939525135407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866939525125423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433469762567711 + 433469762567712.

It is an arithmetic number, because the mean of its divisors is an integer number (433469762567712).

Almost surely, 2^{866939525135423} is an apocalyptic number.

866939525135423 is a deficient number, since it is larger than the sum of its proper divisors (1).

866939525135423 is an equidigital number, since it uses as much as digits as its factorization.

866939525135423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712000, while the sum is 71.

The spelling of 866939525135423 in words is "eight hundred sixty-six trillion, nine hundred thirty-nine billion, five hundred twenty-five million, one hundred thirty-five thousand, four hundred twenty-three".