786517621121 has 4 divisors (see below), whose sum is σ = 786542870100. Its totient is φ = 786492372144.

The previous prime is 786517621103. The next prime is 786517621159. The reversal of 786517621121 is 121126715687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121126715687 = 5077 ⋅23857931.

It can be written as a sum of positive squares in 2 ways, for example, as 41681305600 + 744836315521 = 204160^2 + 863039^2 .

It is a cyclic number.

It is not a de Polignac number, because 786517621121 - 2¹⁴ = 786517604737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (786517624121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12577706 + ... + 12640083.

It is an arithmetic number, because the mean of its divisors is an integer number (196635717525).

Almost surely, 2^786517621121 is an apocalyptic number.

It is an amenable number.

786517621121 is a deficient number, since it is larger than the sum of its proper divisors (25248979).

786517621121 is a wasteful number, since it uses less digits than its factorization.

786517621121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25248978.

The product of its digits is 282240, while the sum is 47.

The spelling of 786517621121 in words is "seven hundred eighty-six billion, five hundred seventeen million, six hundred twenty-one thousand, one hundred twenty-one".