861650783761 has 4 divisors (see below), whose sum is σ = 861653829232. Its totient is φ = 861647738292.

The previous prime is 861650783759. The next prime is 861650783789. The reversal of 861650783761 is 167387056168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861650783761 - 2¹ = 861650783759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861650783696 and 861650783705.

It is not an unprimeable number, because it can be changed into a prime (861650783261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049271 + ... + 1680556.

It is an arithmetic number, because the mean of its divisors is an integer number (215413457308).

Almost surely, 2^861650783761 is an apocalyptic number.

It is an amenable number.

861650783761 is a deficient number, since it is larger than the sum of its proper divisors (3045471).

861650783761 is a wasteful number, since it uses less digits than its factorization.

861650783761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3045470.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 861650783761 in words is "eight hundred sixty-one billion, six hundred fifty million, seven hundred eighty-three thousand, seven hundred sixty-one".