6631545327481 has 2 divisors, whose sum is σ = 6631545327482. Its totient is φ = 6631545327480.

The previous prime is 6631545327479. The next prime is 6631545327487. The reversal of 6631545327481 is 1847235451366.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5975502026256 + 656043301225 = 2444484^2 + 809965^2 .

It is a cyclic number.

It is not a de Polignac number, because 6631545327481 - 2¹ = 6631545327479 is a prime.

It is a super-2 number, since 2×6631545327481² (a number of 26 digits) contains 22 as substring.

Together with 6631545327479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6631545327487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3315772663740 + 3315772663741.

It is an arithmetic number, because the mean of its divisors is an integer number (3315772663741).

Almost surely, 2^{6631545327481} is an apocalyptic number.

It is an amenable number.

6631545327481 is a deficient number, since it is larger than the sum of its proper divisors (1).

6631545327481 is an equidigital number, since it uses as much as digits as its factorization.

6631545327481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 55.

The spelling of 6631545327481 in words is "six trillion, six hundred thirty-one billion, five hundred forty-five million, three hundred twenty-seven thousand, four hundred eighty-one".