6619405813 has 4 divisors (see below), whose sum is σ = 6703195840. Its totient is φ = 6535615788.

The previous prime is 6619405799. The next prime is 6619405823. The reversal of 6619405813 is 3185049166.

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 6619405813 - 2⁵ = 6619405781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6619405813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6619405823) 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, 41894895 + ... + 41895052.

It is an arithmetic number, because the mean of its divisors is an integer number (1675798960).

Almost surely, 2^6619405813 is an apocalyptic number.

It is an amenable number.

6619405813 is a deficient number, since it is larger than the sum of its proper divisors (83790027).

6619405813 is an equidigital number, since it uses as much as digits as its factorization.

6619405813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83790026.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 6619405813 is about 81359.7309054055. The cubic root of 6619405813 is about 1877.6140901341.

The spelling of 6619405813 in words is "six billion, six hundred nineteen million, four hundred five thousand, eight hundred thirteen".