6550211705721 has 4 divisors (see below), whose sum is σ = 8733615607632. Its totient is φ = 4366807803812.

The previous prime is 6550211705717. The next prime is 6550211705731. The reversal of 6550211705721 is 1275071120556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6550211705721 - 2² = 6550211705717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6550211705701) 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, 1091701950951 + ... + 1091701950956.

It is an arithmetic number, because the mean of its divisors is an integer number (2183403901908).

Almost surely, 2^{6550211705721} is an apocalyptic number.

It is an amenable number.

6550211705721 is a deficient number, since it is larger than the sum of its proper divisors (2183403901911).

6550211705721 is a wasteful number, since it uses less digits than its factorization.

6550211705721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183403901910.

The product of its (nonzero) digits is 147000, while the sum is 42.

The spelling of 6550211705721 in words is "six trillion, five hundred fifty billion, two hundred eleven million, seven hundred five thousand, seven hundred twenty-one".