861789181623 has 4 divisors (see below), whose sum is σ = 1149052242168. Its totient is φ = 574526121080.

The previous prime is 861789181621. The next prime is 861789181637. The reversal of 861789181623 is 326181987168.

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 861789181623 - 2¹ = 861789181621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861789181621) 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, 143631530268 + ... + 143631530273.

It is an arithmetic number, because the mean of its divisors is an integer number (287263060542).

Almost surely, 2^861789181623 is an apocalyptic number.

861789181623 is a deficient number, since it is larger than the sum of its proper divisors (287263060545).

861789181623 is a wasteful number, since it uses less digits than its factorization.

861789181623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287263060544.

The product of its digits is 6967296, while the sum is 60.

The spelling of 861789181623 in words is "eight hundred sixty-one billion, seven hundred eighty-nine million, one hundred eighty-one thousand, six hundred twenty-three".