861838618941 has 6 divisors (see below), whose sum is σ = 1244878005150. Its totient is φ = 574559079288.

The previous prime is 861838618919. The next prime is 861838618987. The reversal of 861838618941 is 149816838168.

861838618941 is a `hidden beast` number, since 8 + 6 + 1 + 8 + 3 + 8 + 618 + 9 + 4 + 1 = 666.

861838618941 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., 697283451225 + 164555167716 = 835035^2 + 405654^2 .

It is not a de Polignac number, because 861838618941 - 2²⁶ = 861771510077 is a prime.

It is a super-2 number, since 2×861838618941² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861838618541) 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, 47879923266 + ... + 47879923283.

It is an arithmetic number, because the mean of its divisors is an integer number (207479667525).

Almost surely, 2^861838618941 is an apocalyptic number.

It is an amenable number.

861838618941 is a deficient number, since it is larger than the sum of its proper divisors (383039386209).

861838618941 is a wasteful number, since it uses less digits than its factorization.

861838618941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95759846555 (or 95759846552 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 63.

The spelling of 861838618941 in words is "eight hundred sixty-one billion, eight hundred thirty-eight million, six hundred eighteen thousand, nine hundred forty-one".