866766406465641 has 12 divisors (see below), whose sum is σ = 1270302281652656. Its totient is φ = 525312973615320.

The previous prime is 866766406465607. The next prime is 866766406465649. The reversal of 866766406465641 is 146564604667668.

It is not a de Polignac number, because 866766406465641 - 2¹³ = 866766406457449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866766406465649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1193893121491 + ... + 1193893122216.

Almost surely, 2^{866766406465641} is an apocalyptic number.

It is an amenable number.

866766406465641 is a deficient number, since it is larger than the sum of its proper divisors (403535875187015).

866766406465641 is a wasteful number, since it uses less digits than its factorization.

866766406465641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387786243732 (or 2387786243721 counting only the distinct ones).

The product of its (nonzero) digits is 5016453120, while the sum is 75.

The spelling of 866766406465641 in words is "eight hundred sixty-six trillion, seven hundred sixty-six billion, four hundred six million, four hundred sixty-five thousand, six hundred forty-one".