6473756521 has 4 divisors (see below), whose sum is σ = 6482175700. Its totient is φ = 6465337344.

The previous prime is 6473756501. The next prime is 6473756539. The reversal of 6473756521 is 1256573746.

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 758396521 + 5715360000 = 27539^2 + 75600^2 .

It is a cyclic number.

It is not a de Polignac number, because 6473756521 - 2¹¹ = 6473754473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6473756501) 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 in 3 ways as a sum of consecutive naturals, for example, 4208436 + ... + 4209973.

It is an arithmetic number, because the mean of its divisors is an integer number (1620543925).

Almost surely, 2^6473756521 is an apocalyptic number.

It is an amenable number.

6473756521 is a deficient number, since it is larger than the sum of its proper divisors (8419179).

6473756521 is an equidigital number, since it uses as much as digits as its factorization.

6473756521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8419178.

The product of its digits is 1058400, while the sum is 46.

The square root of 6473756521 is about 80459.6577236071. The cubic root of 6473756521 is about 1863.7405475584.

It can be divided in two parts, 64 and 73756521, that added together give a triangular number (73756585 = T₁₂₁₄₅).

The spelling of 6473756521 in words is "six billion, four hundred seventy-three million, seven hundred fifty-six thousand, five hundred twenty-one".