6621132546 has 72 divisors (see below), whose sum is σ = 16745565564. Its totient is φ = 1885222080.

The previous prime is 6621132527. The next prime is 6621132547. The reversal of 6621132546 is 6452311266.

6621132546 is a `hidden beast` number, since 6 + 621 + 1 + 3 + 25 + 4 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6553712025 + 67420521 = 80955^2 + 8211^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6621132546.

It is not an unprimeable number, because it can be changed into a prime (6621132547) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 245616 + ... + 271236.

Almost surely, 2^6621132546 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6621132546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8372782782).

6621132546 is an abundant number, since it is smaller than the sum of its proper divisors (10124433018).

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

6621132546 is a wasteful number, since it uses less digits than its factorization.

6621132546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25936 (or 25926 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 6621132546 is about 81370.3419311975. The cubic root of 6621132546 is about 1877.7773402520. Note that the first 3 decimals are identical.

The spelling of 6621132546 in words is "six billion, six hundred twenty-one million, one hundred thirty-two thousand, five hundred forty-six".