6551072221571 has 4 divisors (see below), whose sum is σ = 6551080372200. Its totient is φ = 6551064070944.

The previous prime is 6551072221429. The next prime is 6551072221607. The reversal of 6551072221571 is 1751222701556.

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 6551072221571 - 2¹⁰ = 6551072220547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6551072221271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2719286 + ... + 4527323.

It is an arithmetic number, because the mean of its divisors is an integer number (1637770093050).

Almost surely, 2^{6551072221571} is an apocalyptic number.

6551072221571 is a deficient number, since it is larger than the sum of its proper divisors (8150629).

6551072221571 is an equidigital number, since it uses as much as digits as its factorization.

6551072221571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8150628.

The product of its (nonzero) digits is 294000, while the sum is 44.

The spelling of 6551072221571 in words is "six trillion, five hundred fifty-one billion, seventy-two million, two hundred twenty-one thousand, five hundred seventy-one".