861614586181 has 4 divisors (see below), whose sum is σ = 899076089952. Its totient is φ = 824153082412.

The previous prime is 861614586149. The next prime is 861614586191. The reversal of 861614586181 is 181685416168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861614586181 - 2⁵ = 861614586149 is a prime.

It is a super-2 number, since 2×861614586181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861614586191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18730751851 + ... + 18730751896.

It is an arithmetic number, because the mean of its divisors is an integer number (224769022488).

Almost surely, 2^861614586181 is an apocalyptic number.

It is an amenable number.

861614586181 is a deficient number, since it is larger than the sum of its proper divisors (37461503771).

861614586181 is a wasteful number, since it uses less digits than its factorization.

861614586181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37461503770.

The product of its digits is 2211840, while the sum is 55.

The spelling of 861614586181 in words is "eight hundred sixty-one billion, six hundred fourteen million, five hundred eighty-six thousand, one hundred eighty-one".