627647949881 has 2 divisors, whose sum is σ = 627647949882. Its totient is φ = 627647949880.

The previous prime is 627647949871. The next prime is 627647949967. The reversal of 627647949881 is 188949746726.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622576231225 + 5071718656 = 789035^2 + 71216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-627647949881 is a prime.

It is a super-2 number, since 2×627647949881² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (627647949871) 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, 313823974940 + 313823974941.

It is an arithmetic number, because the mean of its divisors is an integer number (313823974941).

Almost surely, 2^627647949881 is an apocalyptic number.

It is an amenable number.

627647949881 is a deficient number, since it is larger than the sum of its proper divisors (1).

627647949881 is an equidigital number, since it uses as much as digits as its factorization.

627647949881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 292626432, while the sum is 71.

The spelling of 627647949881 in words is "six hundred twenty-seven billion, six hundred forty-seven million, nine hundred forty-nine thousand, eight hundred eighty-one".