6411256609 has 4 divisors (see below), whose sum is σ = 6499082116. Its totient is φ = 6323431104.

The previous prime is 6411256591. The next prime is 6411256627. The reversal of 6411256609 is 9066521146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9066521146 = 2 ⋅4533260573.

It is an interprime number because it is at equal distance from previous prime (6411256591) and next prime (6411256627).

It can be written as a sum of positive squares in 2 ways, for example, as 1684281600 + 4726975009 = 41040^2 + 68753^2 .

It is a cyclic number.

It is not a de Polignac number, because 6411256609 - 2¹¹ = 6411254561 is a prime.

It is a super-2 number, since 2×6411256609² = 82208422612892357762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6411256679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43912644 + ... + 43912789.

It is an arithmetic number, because the mean of its divisors is an integer number (1624770529).

Almost surely, 2^6411256609 is an apocalyptic number.

It is an amenable number.

6411256609 is a deficient number, since it is larger than the sum of its proper divisors (87825507).

6411256609 is an equidigital number, since it uses as much as digits as its factorization.

6411256609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87825506.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 6411256609 is about 80070.3228980626. The cubic root of 6411256609 is about 1857.7234073652.

The spelling of 6411256609 in words is "six billion, four hundred eleven million, two hundred fifty-six thousand, six hundred nine".