31671763356661 has 4 divisors (see below), whose sum is σ = 33534808260012. Its totient is φ = 29808718453312.

The previous prime is 31671763356659. The next prime is 31671763356677. The reversal of 31671763356661 is 16665336717613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19003104155025 + 12668659201636 = 4359255^2 + 3559306^2 .

It is a cyclic number.

It is not a de Polignac number, because 31671763356661 - 2¹ = 31671763356659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31671763356661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31671763356061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 931522451650 + ... + 931522451683.

It is an arithmetic number, because the mean of its divisors is an integer number (8383702065003).

Almost surely, 2^{31671763356661} is an apocalyptic number.

It is an amenable number.

31671763356661 is a deficient number, since it is larger than the sum of its proper divisors (1863044903351).

31671763356661 is a wasteful number, since it uses less digits than its factorization.

31671763356661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863044903350.

The product of its digits is 51438240, while the sum is 61.

The spelling of 31671763356661 in words is "thirty-one trillion, six hundred seventy-one billion, seven hundred sixty-three million, three hundred fifty-six thousand, six hundred sixty-one".