3168688366561 has 3 divisors (see below), whose sum is σ = 3168690146643. Its totient is φ = 3168686586480.

The previous prime is 3168688366553. The next prime is 3168688366577. The reversal of 3168688366561 is 1656638868613.

The square root of 3168688366561 is 1780081.

It is a perfect power (a square), and thus also a powerful number.

3168688366561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1047820424161 + 2120867942400 = 1023631^2 + 1456320^2 .

It is not a de Polignac number, because 3168688366561 - 2³ = 3168688366553 is a prime.

It is a super-4 number, since 4×3168688366561⁴ (a number of 51 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3168688366531) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 890041 + ... + 2670121.

It is an arithmetic number, because the mean of its divisors is an integer number (1056230048881).

Almost surely, 2^{3168688366561} is an apocalyptic number.

3168688366561 is the 1780081-st square number.

3168688366561 is the 890041-st centered octagonal number.

It is an amenable number.

3168688366561 is a deficient number, since it is larger than the sum of its proper divisors (1780082).

3168688366561 is an frugal number, since it uses more digits than its factorization.

3168688366561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560162 (or 1780081 counting only the distinct ones).

The product of its digits is 179159040, while the sum is 67.

The spelling of 3168688366561 in words is "three trillion, one hundred sixty-eight billion, six hundred eighty-eight million, three hundred sixty-six thousand, five hundred sixty-one".