6537897409 has 2 divisors, whose sum is σ = 6537897410. Its totient is φ = 6537897408.

The previous prime is 6537897403. The next prime is 6537897449. The reversal of 6537897409 is 9047987356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5512617009 + 1025280400 = 74247^2 + 32020^2 .

It is a cyclic number.

It is not a de Polignac number, because 6537897409 - 2¹³ = 6537889217 is a prime.

It is not a weakly prime, because it can be changed into another prime (6537897403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3268948704 + 3268948705.

It is an arithmetic number, because the mean of its divisors is an integer number (3268948705).

Almost surely, 2^6537897409 is an apocalyptic number.

It is an amenable number.

6537897409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6537897409 is an equidigital number, since it uses as much as digits as its factorization.

6537897409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 58.

The square root of 6537897409 is about 80857.2656537432. The cubic root of 6537897409 is about 1869.8755394874.

The spelling of 6537897409 in words is "six billion, five hundred thirty-seven million, eight hundred ninety-seven thousand, four hundred nine".