6621461551 has 8 divisors (see below), whose sum is σ = 6716747520. Its totient is φ = 6526462488.

The previous prime is 6621461543. The next prime is 6621461591. The reversal of 6621461551 is 1551641266.

6621461551 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6621461551 - 2³ = 6621461543 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 6621461551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621461521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25021 + ... + 117766.

It is an arithmetic number, because the mean of its divisors is an integer number (839593440).

Almost surely, 2^6621461551 is an apocalyptic number.

6621461551 is a deficient number, since it is larger than the sum of its proper divisors (95285969).

6621461551 is a wasteful number, since it uses less digits than its factorization.

6621461551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143453.

The product of its digits is 43200, while the sum is 37.

The square root of 6621461551 is about 81372.3635579058. The cubic root of 6621461551 is about 1877.8084420762.

It can be divided in two parts, 66214 and 61551, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 6621461551 in words is "six billion, six hundred twenty-one million, four hundred sixty-one thousand, five hundred fifty-one".