866443616511604 has 24 divisors (see below), whose sum is σ = 1525359247392960. Its totient is φ = 430626700316736.

The previous prime is 866443616511569. The next prime is 866443616511617. The reversal of 866443616511604 is 406115616344668.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366334099 + ... + 368691685.

It is an arithmetic number, because the mean of its divisors is an integer number (63556635308040).

Almost surely, 2^{866443616511604} is an apocalyptic number.

It is an amenable number.

866443616511604 is a deficient number, since it is larger than the sum of its proper divisors (658915630881356).

866443616511604 is a wasteful number, since it uses less digits than its factorization.

866443616511604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907927 (or 2907925 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 61.

The spelling of 866443616511604 in words is "eight hundred sixty-six trillion, four hundred forty-three billion, six hundred sixteen million, five hundred eleven thousand, six hundred four".