6556738571 has 4 divisors (see below), whose sum is σ = 6624333912. Its totient is φ = 6489143232.

The previous prime is 6556738553. The next prime is 6556738583. The reversal of 6556738571 is 1758376556.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6556738571 - 2¹⁴ = 6556722187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556738871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33797525 + ... + 33797718.

It is an arithmetic number, because the mean of its divisors is an integer number (1656083478).

Almost surely, 2^6556738571 is an apocalyptic number.

6556738571 is a deficient number, since it is larger than the sum of its proper divisors (67595341).

6556738571 is an equidigital number, since it uses as much as digits as its factorization.

6556738571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67595340.

The product of its digits is 5292000, while the sum is 53.

The square root of 6556738571 is about 80973.6906099753. The cubic root of 6556738571 is about 1871.6700429722.

The spelling of 6556738571 in words is "six billion, five hundred fifty-six million, seven hundred thirty-eight thousand, five hundred seventy-one".