6621461550 has 144 divisors (see below), whose sum is σ = 19725947280. Its totient is φ = 1578816000.

The previous prime is 6621461543. The next prime is 6621461591. The reversal of 6621461550 is 551641266.

6621461550 is a `hidden beast` number, since 6 + 62 + 1 + 46 + 1 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 290986 + ... + 312914.

It is an arithmetic number, because the mean of its divisors is an integer number (136985745).

Almost surely, 2^6621461550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6621461550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9862973640).

6621461550 is an abundant number, since it is smaller than the sum of its proper divisors (13104485730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6621461550 is a wasteful number, since it uses less digits than its factorization.

6621461550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22019 (or 22011 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 6621461550 is about 81372.3635517612. The cubic root of 6621461550 is about 1877.8084419817.

The spelling of 6621461550 in words is "six billion, six hundred twenty-one million, four hundred sixty-one thousand, five hundred fifty".