861716079555 has 32 divisors (see below), whose sum is σ = 1412483788800. Its totient is φ = 448337637120.

The previous prime is 861716079503. The next prime is 861716079563. The reversal of 861716079555 is 555970617168.

It is a happy number.

It is not a de Polignac number, because 861716079555 - 2⁹ = 861716079043 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 9081246 + ... + 9175644.

It is an arithmetic number, because the mean of its divisors is an integer number (44140118400).

Almost surely, 2^861716079555 is an apocalyptic number.

861716079555 is a deficient number, since it is larger than the sum of its proper divisors (550767709245).

861716079555 is a wasteful number, since it uses less digits than its factorization.

861716079555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109291.

The product of its (nonzero) digits is 15876000, while the sum is 60.

The spelling of 861716079555 in words is "eight hundred sixty-one billion, seven hundred sixteen million, seventy-nine thousand, five hundred fifty-five".