6620542321 has 8 divisors (see below), whose sum is σ = 6688281600. Its totient is φ = 6553063920.

The previous prime is 6620542319. The next prime is 6620542333. The reversal of 6620542321 is 1232450266.

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 6620542321 - 2¹ = 6620542319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6620542351) 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, 14001 + ... + 115918.

It is an arithmetic number, because the mean of its divisors is an integer number (836035200).

Almost surely, 2^6620542321 is an apocalyptic number.

It is an amenable number.

6620542321 is a deficient number, since it is larger than the sum of its proper divisors (67739279).

6620542321 is a wasteful number, since it uses less digits than its factorization.

6620542321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130439.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6620542321 is about 81366.7150682636. The cubic root of 6620542321 is about 1877.7215419397.

Adding to 6620542321 its reverse (1232450266), we get a palindrome (7852992587).

The spelling of 6620542321 in words is "six billion, six hundred twenty million, five hundred forty-two thousand, three hundred twenty-one".