6448817761 has 4 divisors (see below), whose sum is σ = 6449649300. Its totient is φ = 6447986224.

The previous prime is 6448817741. The next prime is 6448817777. The reversal of 6448817761 is 1677188446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2187339361 + 4261478400 = 46769^2 + 65280^2 .

It is a cyclic number.

It is not a de Polignac number, because 6448817761 - 2¹³ = 6448809569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6448817699 and 6448817708.

It is not an unprimeable number, because it can be changed into a prime (6448817741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404026 + ... + 419683.

It is an arithmetic number, because the mean of its divisors is an integer number (1612412325).

Almost surely, 2^6448817761 is an apocalyptic number.

It is an amenable number.

6448817761 is a deficient number, since it is larger than the sum of its proper divisors (831539).

6448817761 is an equidigital number, since it uses as much as digits as its factorization.

6448817761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831538.

The product of its digits is 1806336, while the sum is 52.

The square root of 6448817761 is about 80304.5313852213. The cubic root of 6448817761 is about 1861.3442474567.

The spelling of 6448817761 in words is "six billion, four hundred forty-eight million, eight hundred seventeen thousand, seven hundred sixty-one".