861538547701 has 6 divisors (see below), whose sum is σ = 932908605090. Its totient is φ = 795266351568.

The previous prime is 861538547687. The next prime is 861538547719. The reversal of 861538547701 is 107745835168.

It can be written as a sum of positive squares in 3 ways, for example, as 17622562500 + 843915985201 = 132750^2 + 918649^2 .

It is not a de Polignac number, because 861538547701 - 2¹¹ = 861538545653 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 (861538547791) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2548930446 + ... + 2548930783.

It is an arithmetic number, because the mean of its divisors is an integer number (155484767515).

Almost surely, 2^861538547701 is an apocalyptic number.

It is an amenable number.

861538547701 is a deficient number, since it is larger than the sum of its proper divisors (71370057389).

861538547701 is a wasteful number, since it uses less digits than its factorization.

861538547701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5097861255 (or 5097861242 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 55.

The spelling of 861538547701 in words is "eight hundred sixty-one billion, five hundred thirty-eight million, five hundred forty-seven thousand, seven hundred one".