861372995917 has 54 divisors (see below), whose sum is σ = 1047195892206. Its totient is φ = 705940310880.

The previous prime is 861372995867. The next prime is 861372995953. The reversal of 861372995917 is 719599273168.

861372995917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 838092644676 + 23280351241 = 915474^2 + 152579^2 .

It is not a de Polignac number, because 861372995917 - 2¹⁹ = 861372471629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861372995957) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 2805775078 + ... + 2805775384.

Almost surely, 2^861372995917 is an apocalyptic number.

It is an amenable number.

861372995917 is a deficient number, since it is larger than the sum of its proper divisors (185822896289).

861372995917 is an frugal number, since it uses more digits than its factorization.

861372995917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 422 counting only the distinct ones).

The product of its digits is 51438240, while the sum is 67.

The spelling of 861372995917 in words is "eight hundred sixty-one billion, three hundred seventy-two million, nine hundred ninety-five thousand, nine hundred seventeen".