6475432721 has 2 divisors, whose sum is σ = 6475432722. Its totient is φ = 6475432720.

The previous prime is 6475432669. The next prime is 6475432727. The reversal of 6475432721 is 1272345746.

6475432721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3898753600 + 2576679121 = 62440^2 + 50761^2 .

It is a cyclic number.

It is not a de Polignac number, because 6475432721 - 2¹⁸ = 6475170577 is a prime.

It is not a weakly prime, because it can be changed into another prime (6475432727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3237716360 + 3237716361.

It is an arithmetic number, because the mean of its divisors is an integer number (3237716361).

Almost surely, 2^6475432721 is an apocalyptic number.

It is an amenable number.

6475432721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6475432721 is an equidigital number, since it uses as much as digits as its factorization.

6475432721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 41.

The square root of 6475432721 is about 80470.0734496993. The cubic root of 6475432721 is about 1863.9013883474.

The spelling of 6475432721 in words is "six billion, four hundred seventy-five million, four hundred thirty-two thousand, seven hundred twenty-one".