861765676379 has 4 divisors (see below), whose sum is σ = 878025406176. Its totient is φ = 845505946584.

The previous prime is 861765676349. The next prime is 861765676391. The reversal of 861765676379 is 973676567168.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861765676379 - 2¹⁶ = 861765610843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861765676339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8129864819 + ... + 8129864924.

It is an arithmetic number, because the mean of its divisors is an integer number (219506351544).

Almost surely, 2^861765676379 is an apocalyptic number.

861765676379 is a deficient number, since it is larger than the sum of its proper divisors (16259729797).

861765676379 is a wasteful number, since it uses less digits than its factorization.

861765676379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16259729796.

The product of its digits is 480090240, while the sum is 71.

The spelling of 861765676379 in words is "eight hundred sixty-one billion, seven hundred sixty-five million, six hundred seventy-six thousand, three hundred seventy-nine".