6567280649 has 4 divisors (see below), whose sum is σ = 6567445764. Its totient is φ = 6567115536.

The previous prime is 6567280639. The next prime is 6567280661. The reversal of 6567280649 is 9460827656.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2536935424 + 4030345225 = 50368^2 + 63485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6567280649 is a prime.

It is a super-2 number, since 2×6567280649² = 86258350245459722402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6567280649.

It is not an unprimeable number, because it can be changed into a prime (6567280639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17639 + ... + 115955.

It is an arithmetic number, because the mean of its divisors is an integer number (1641861441).

Almost surely, 2^6567280649 is an apocalyptic number.

It is an amenable number.

6567280649 is a deficient number, since it is larger than the sum of its proper divisors (165115).

6567280649 is an equidigital number, since it uses as much as digits as its factorization.

6567280649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165114.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The square root of 6567280649 is about 81038.7601645040. The cubic root of 6567280649 is about 1872.6726108390.

The spelling of 6567280649 in words is "six billion, five hundred sixty-seven million, two hundred eighty thousand, six hundred forty-nine".