866440680802 has 8 divisors (see below), whose sum is σ = 1312528952412. Its totient is φ = 428931030000.

The previous prime is 866440680799. The next prime is 866440680823. The reversal of 866440680802 is 208086044668.

It can be written as a sum of positive squares in 2 ways, for example, as 674946045601 + 191494635201 = 821551^2 + 437601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 866440680802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144654949 + ... + 2144655352.

Almost surely, 2^866440680802 is an apocalyptic number.

866440680802 is a deficient number, since it is larger than the sum of its proper divisors (446088271610).

866440680802 is a wasteful number, since it uses less digits than its factorization.

866440680802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289310404.

The product of its (nonzero) digits is 3538944, while the sum is 52.

The spelling of 866440680802 in words is "eight hundred sixty-six billion, four hundred forty million, six hundred eighty thousand, eight hundred two".