6621651323 has 4 divisors (see below), whose sum is σ = 7567601520. Its totient is φ = 5675701128.

The previous prime is 6621651269. The next prime is 6621651341. The reversal of 6621651323 is 3231561266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3231561266 = 2 ⋅1615780633.

It is a cyclic number.

It is not a de Polignac number, because 6621651323 - 2¹⁴ = 6621634939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6621651923) 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, 472975088 + ... + 472975101.

It is an arithmetic number, because the mean of its divisors is an integer number (1891900380).

Almost surely, 2^6621651323 is an apocalyptic number.

6621651323 is a deficient number, since it is larger than the sum of its proper divisors (945950197).

6621651323 is an equidigital number, since it uses as much as digits as its factorization.

6621651323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945950196.

The product of its digits is 38880, while the sum is 35.

The square root of 6621651323 is about 81373.5296211243. The cubic root of 6621651323 is about 1877.8263813210.

The spelling of 6621651323 in words is "six billion, six hundred twenty-one million, six hundred fifty-one thousand, three hundred twenty-three".