866977121779668 has 36 divisors (see below), whose sum is σ = 2193397001531008. Its totient is φ = 288745582816080.

The previous prime is 866977121779547. The next prime is 866977121779673.

866977121779668 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10282920196 + ... + 10283004507.

Almost surely, 2^{866977121779668} is an apocalyptic number.

It is an amenable number.

866977121779668 is an abundant number, since it is smaller than the sum of its proper divisors (1326419879751340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866977121779668 is a wasteful number, since it uses less digits than its factorization.

866977121779668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20565925884 (or 20565925879 counting only the distinct ones).

The product of its digits is 32262064128, while the sum is 90.

The spelling of 866977121779668 in words is "eight hundred sixty-six trillion, nine hundred seventy-seven billion, one hundred twenty-one million, seven hundred seventy-nine thousand, six hundred sixty-eight".