6511550221 has 8 divisors (see below), whose sum is σ = 7110561600. Its totient is φ = 5913714240.

The previous prime is 6511550197. The next prime is 6511550251. The reversal of 6511550221 is 1220551156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6511550221 - 2³¹ = 4364066573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6511550221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6511550251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282241 + ... + 304438.

It is an arithmetic number, because the mean of its divisors is an integer number (888820200).

Almost surely, 2^6511550221 is an apocalyptic number.

It is an amenable number.

6511550221 is a deficient number, since it is larger than the sum of its proper divisors (599011379).

6511550221 is a wasteful number, since it uses less digits than its factorization.

6511550221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587699.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 6511550221 is about 80694.1771195419. The cubic root of 6511550221 is about 1867.3603429795.

The spelling of 6511550221 in words is "six billion, five hundred eleven million, five hundred fifty thousand, two hundred twenty-one".