861587949785168 has 10 divisors (see below), whose sum is σ = 1669326652708794. Its totient is φ = 430793974892576.

The previous prime is 861587949785141. The next prime is 861587949785179.

It is a happy number.

861587949785168 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 577420330503184 + 284167619281984 = 24029572^2 + 16857272^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26924623430771 + ... + 26924623430802.

Almost surely, 2^{861587949785168} is an apocalyptic number.

It is an amenable number.

861587949785168 is a deficient number, since it is larger than the sum of its proper divisors (807738702923626).

861587949785168 is a wasteful number, since it uses less digits than its factorization.

861587949785168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53849246861581 (or 53849246861575 counting only the distinct ones).

The product of its digits is 58525286400, while the sum is 92.

The spelling of 861587949785168 in words is "eight hundred sixty-one trillion, five hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-five thousand, one hundred sixty-eight".