6651324521 has 4 divisors (see below), whose sum is σ = 6792842112. Its totient is φ = 6509806932.

The previous prime is 6651324479. The next prime is 6651324541. The reversal of 6651324521 is 1254231566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6651324521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6651324541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70758725 + ... + 70758818.

It is an arithmetic number, because the mean of its divisors is an integer number (1698210528).

Almost surely, 2^6651324521 is an apocalyptic number.

It is an amenable number.

6651324521 is a deficient number, since it is larger than the sum of its proper divisors (141517591).

6651324521 is a wasteful number, since it uses less digits than its factorization.

6651324521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141517590.

The product of its digits is 43200, while the sum is 35.

The square root of 6651324521 is about 81555.6529064663. The cubic root of 6651324521 is about 1880.6271976486.

The spelling of 6651324521 in words is "six billion, six hundred fifty-one million, three hundred twenty-four thousand, five hundred twenty-one".