31168408661 has 8 divisors (see below), whose sum is σ = 33573142680. Its totient is φ = 28764698112.

The previous prime is 31168408639. The next prime is 31168408679. The reversal of 31168408661 is 16680486113.

It can be written as a sum of positive squares in 4 ways, for example, as 2053811761 + 29114596900 = 45319^2 + 170630^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31168408661 - 2⁶ = 31168408597 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 (31168408861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192020 + ... + 314973.

It is an arithmetic number, because the mean of its divisors is an integer number (4196642835).

Almost surely, 2^31168408661 is an apocalyptic number.

It is an amenable number.

31168408661 is a deficient number, since it is larger than the sum of its proper divisors (2404734019).

31168408661 is a wasteful number, since it uses less digits than its factorization.

31168408661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511735.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 31168408661 in words is "thirty-one billion, one hundred sixty-eight million, four hundred eight thousand, six hundred sixty-one".