865968066634521 has 8 divisors (see below), whose sum is σ = 1166527429968544. Its totient is φ = 571360373861760.

The previous prime is 865968066634477. The next prime is 865968066634523. The reversal of 865968066634521 is 125436660869568.

It is a happy number.

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

It is not a de Polignac number, because 865968066634521 - 2⁷ = 865968066634393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865968066634523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1487917639975 + ... + 1487917640556.

It is an arithmetic number, because the mean of its divisors is an integer number (145815928746068).

Almost surely, 2^{865968066634521} is an apocalyptic number.

It is an amenable number.

865968066634521 is a deficient number, since it is larger than the sum of its proper divisors (300559363334023).

865968066634521 is a wasteful number, since it uses less digits than its factorization.

865968066634521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2975835280631.

The product of its (nonzero) digits is 2687385600, while the sum is 75.

The spelling of 865968066634521 in words is "eight hundred sixty-five trillion, nine hundred sixty-eight billion, sixty-six million, six hundred thirty-four thousand, five hundred twenty-one".