6621132505 has 8 divisors (see below), whose sum is σ = 8556540552. Its totient is φ = 4889451648.

The previous prime is 6621132503. The next prime is 6621132527. The reversal of 6621132505 is 5052311266.

It can be written as a sum of positive squares in 4 ways, for example, as 197430601 + 6423701904 = 14051^2 + 80148^2 .

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 6621132505 - 2¹ = 6621132503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6621132503) 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, 50931724 + ... + 50931853.

It is an arithmetic number, because the mean of its divisors is an integer number (1069567569).

Almost surely, 2^6621132505 is an apocalyptic number.

6621132505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6621132505 is a deficient number, since it is larger than the sum of its proper divisors (1935408047).

6621132505 is a wasteful number, since it uses less digits than its factorization.

6621132505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101863595.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 6621132505 is about 81370.3416792630. The cubic root of 6621132505 is about 1877.7773363761. Note that the first 3 decimals are identical.

The spelling of 6621132505 in words is "six billion, six hundred twenty-one million, one hundred thirty-two thousand, five hundred five".