31566421361543 has 2 divisors, whose sum is σ = 31566421361544. Its totient is φ = 31566421361542.

The previous prime is 31566421361539. The next prime is 31566421361549. The reversal of 31566421361543 is 34516312466513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31566421361543 - 2² = 31566421361539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31566421361491 and 31566421361500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31566421361549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15783210680771 + 15783210680772.

It is an arithmetic number, because the mean of its divisors is an integer number (15783210680772).

Almost surely, 2^{31566421361543} is an apocalyptic number.

31566421361543 is a deficient number, since it is larger than the sum of its proper divisors (1).

31566421361543 is an equidigital number, since it uses as much as digits as its factorization.

31566421361543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4665600, while the sum is 50.

The spelling of 31566421361543 in words is "thirty-one trillion, five hundred sixty-six billion, four hundred twenty-one million, three hundred sixty-one thousand, five hundred forty-three".