6615546421 has 8 divisors (see below), whose sum is σ = 7248477600. Its totient is φ = 5987868240.

The previous prime is 6615546341. The next prime is 6615546449. The reversal of 6615546421 is 1246455166.

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 6615546421 - 2²⁹ = 6078675509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6615546121) 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, 1310611 + ... + 1315648.

It is an arithmetic number, because the mean of its divisors is an integer number (906059700).

Almost surely, 2^6615546421 is an apocalyptic number.

It is an amenable number.

6615546421 is a deficient number, since it is larger than the sum of its proper divisors (632931179).

6615546421 is a wasteful number, since it uses less digits than its factorization.

6615546421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626499.

The product of its digits is 172800, while the sum is 40.

The square root of 6615546421 is about 81336.0093746921. The cubic root of 6615546421 is about 1877.2491098631.

The spelling of 6615546421 in words is "six billion, six hundred fifteen million, five hundred forty-six thousand, four hundred twenty-one".