6619893421 has 4 divisors (see below), whose sum is σ = 6644321344. Its totient is φ = 6595465500.

The previous prime is 6619893407. The next prime is 6619893431. The reversal of 6619893421 is 1243989166.

It is a happy number.

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 not a de Polignac number, because 6619893421 - 2⁵ = 6619893389 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 (6619893431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12213555 + ... + 12214096.

It is an arithmetic number, because the mean of its divisors is an integer number (1661080336).

Almost surely, 2^6619893421 is an apocalyptic number.

It is an amenable number.

6619893421 is a deficient number, since it is larger than the sum of its proper divisors (24427923).

6619893421 is a wasteful number, since it uses less digits than its factorization.

6619893421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24427922.

The product of its digits is 559872, while the sum is 49.

The square root of 6619893421 is about 81362.7274678031. The cubic root of 6619893421 is about 1877.6601928206.

The spelling of 6619893421 in words is "six billion, six hundred nineteen million, eight hundred ninety-three thousand, four hundred twenty-one".