861767343361 has 4 divisors (see below), whose sum is σ = 862285545472. Its totient is φ = 861249141252.

The previous prime is 861767343313. The next prime is 861767343379. The reversal of 861767343361 is 163343767168.

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 a de Polignac number, because none of the positive numbers 2^k-861767343361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861767343461) 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, 259098561 + ... + 259101886.

It is an arithmetic number, because the mean of its divisors is an integer number (215571386368).

Almost surely, 2^861767343361 is an apocalyptic number.

It is an amenable number.

861767343361 is a deficient number, since it is larger than the sum of its proper divisors (518202111).

861767343361 is a wasteful number, since it uses less digits than its factorization.

861767343361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518202110.

The product of its digits is 9144576, while the sum is 55.

It can be divided in two parts, 861767 and 343361, that added together give a triangular number (1205128 = T₁₅₅₂).

The spelling of 861767343361 in words is "eight hundred sixty-one billion, seven hundred sixty-seven million, three hundred forty-three thousand, three hundred sixty-one".