861159240387 has 8 divisors (see below), whose sum is σ = 1275791467280. Its totient is φ = 574106160240.

The previous prime is 861159240373. The next prime is 861159240391. The reversal of 861159240387 is 783042951168.

861159240387 is a `hidden beast` number, since 8 + 6 + 1 + 1 + 592 + 40 + 3 + 8 + 7 = 666.

It is not a de Polignac number, because 861159240387 - 2⁷ = 861159240259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861159240287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15947393314 + ... + 15947393367.

It is an arithmetic number, because the mean of its divisors is an integer number (159473933410).

It is a 1-persistent number, because it is pandigital, but 2⋅861159240387 = 1722318480774 is not.

Almost surely, 2^861159240387 is an apocalyptic number.

861159240387 is a deficient number, since it is larger than the sum of its proper divisors (414632226893).

861159240387 is a wasteful number, since it uses less digits than its factorization.

861159240387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31894786690 (or 31894786684 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 861159240387 in words is "eight hundred sixty-one billion, one hundred fifty-nine million, two hundred forty thousand, three hundred eighty-seven".