861686118425 has 24 divisors (see below), whose sum is σ = 1168318452000. Its totient is φ = 625233427200.

The previous prime is 861686118421. The next prime is 861686118473. The reversal of 861686118425 is 524811686168.

It is not a de Polignac number, because 861686118425 - 2² = 861686118421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861686118421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3499175 + ... + 3737324.

It is an arithmetic number, because the mean of its divisors is an integer number (48679935500).

Almost surely, 2^861686118425 is an apocalyptic number.

It is an amenable number.

861686118425 is a deficient number, since it is larger than the sum of its proper divisors (306632333575).

861686118425 is a wasteful number, since it uses less digits than its factorization.

861686118425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7236953 (or 7236948 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 56.

The spelling of 861686118425 in words is "eight hundred sixty-one billion, six hundred eighty-six million, one hundred eighteen thousand, four hundred twenty-five".