866788770087583 has 16 divisors (see below), whose sum is σ = 1043975861931520. Its totient is φ = 703033393489056.

The previous prime is 866788770087577. The next prime is 866788770087587. The reversal of 866788770087583 is 385780077887668.

It is a happy number.

It is not a de Polignac number, because 866788770087583 - 2⁵ = 866788770087551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866788770087494 and 866788770087503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866788770087587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3820055835 + ... + 3820282732.

It is an arithmetic number, because the mean of its divisors is an integer number (65248491370720).

Almost surely, 2^{866788770087583} is an apocalyptic number.

866788770087583 is a deficient number, since it is larger than the sum of its proper divisors (177187091843937).

866788770087583 is a wasteful number, since it uses less digits than its factorization.

866788770087583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640339446.

The product of its (nonzero) digits is 42485022720, while the sum is 88.

The spelling of 866788770087583 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, seven hundred seventy million, eighty-seven thousand, five hundred eighty-three".