861722039144 has 16 divisors (see below), whose sum is σ = 1615877942400. Its totient is φ = 430821254512.

The previous prime is 861722039119. The next prime is 861722039149. The reversal of 861722039144 is 441930227168.

It is a super-4 number, since 4×861722039144⁴ (a number of 49 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (861722039149) 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, 4878434 + ... + 5051985.

It is an arithmetic number, because the mean of its divisors is an integer number (100992371400).

Almost surely, 2^861722039144 is an apocalyptic number.

It is an amenable number.

861722039144 is a deficient number, since it is larger than the sum of its proper divisors (754155903256).

861722039144 is a wasteful number, since it uses less digits than its factorization.

861722039144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9941272 (or 9941268 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 861722039144 in words is "eight hundred sixty-one billion, seven hundred twenty-two million, thirty-nine thousand, one hundred forty-four".