31580666389 has 2 divisors, whose sum is σ = 31580666390. Its totient is φ = 31580666388.

The previous prime is 31580666387. The next prime is 31580666393. The reversal of 31580666389 is 98366608513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20575607364 + 11005059025 = 143442^2 + 104905^2 .

It is a cyclic number.

It is not a de Polignac number, because 31580666389 - 2¹ = 31580666387 is a prime.

Together with 31580666387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31580666387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15790333194 + 15790333195.

It is an arithmetic number, because the mean of its divisors is an integer number (15790333195).

Almost surely, 2^31580666389 is an apocalyptic number.

It is an amenable number.

31580666389 is a deficient number, since it is larger than the sum of its proper divisors (1).

31580666389 is an equidigital number, since it uses as much as digits as its factorization.

31580666389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 31580666389 in words is "thirty-one billion, five hundred eighty million, six hundred sixty-six thousand, three hundred eighty-nine".