6400881437 has 2 divisors, whose sum is σ = 6400881438. Its totient is φ = 6400881436.

The previous prime is 6400881379. The next prime is 6400881511. The reversal of 6400881437 is 7341880046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6288648601 + 112232836 = 79301^2 + 10594^2 .

It is a cyclic number.

It is not a de Polignac number, because 6400881437 - 2⁶ = 6400881373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6400881394 and 6400881403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400881737) 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, 3200440718 + 3200440719.

It is an arithmetic number, because the mean of its divisors is an integer number (3200440719).

Almost surely, 2^6400881437 is an apocalyptic number.

It is an amenable number.

6400881437 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400881437 is an equidigital number, since it uses as much as digits as its factorization.

6400881437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 6400881437 is about 80005.5087915826. The cubic root of 6400881437 is about 1856.7207642853.

The spelling of 6400881437 in words is "six billion, four hundred million, eight hundred eighty-one thousand, four hundred thirty-seven".