866764721613 has 8 divisors (see below), whose sum is σ = 1320784337728. Its totient is φ = 495294126624.

The previous prime is 866764721611. The next prime is 866764721621. The reversal of 866764721613 is 316127467668.

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

It is not a de Polignac number, because 866764721613 - 2¹ = 866764721611 is a prime.

It is a super-2 number, since 2×866764721613² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866764721611) 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, 20637255256 + ... + 20637255297.

It is an arithmetic number, because the mean of its divisors is an integer number (165098042216).

Almost surely, 2^866764721613 is an apocalyptic number.

It is an amenable number.

866764721613 is a deficient number, since it is larger than the sum of its proper divisors (454019616115).

866764721613 is a wasteful number, since it uses less digits than its factorization.

866764721613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41274510563.

The product of its digits is 12192768, while the sum is 57.

The spelling of 866764721613 in words is "eight hundred sixty-six billion, seven hundred sixty-four million, seven hundred twenty-one thousand, six hundred thirteen".