6671619643 has 4 divisors (see below), whose sum is σ = 7184821168. Its totient is φ = 6158418120.

The previous prime is 6671619631. The next prime is 6671619653. The reversal of 6671619643 is 3469161766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6671619643 - 2⁵ = 6671619611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6671619653) 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, 256600743 + ... + 256600768.

It is an arithmetic number, because the mean of its divisors is an integer number (1796205292).

Almost surely, 2^6671619643 is an apocalyptic number.

6671619643 is a deficient number, since it is larger than the sum of its proper divisors (513201525).

6671619643 is a wasteful number, since it uses less digits than its factorization.

6671619643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513201524.

The product of its digits is 979776, while the sum is 49.

The square root of 6671619643 is about 81679.9831231618. The cubic root of 6671619643 is about 1882.5380353003.

The spelling of 6671619643 in words is "six billion, six hundred seventy-one million, six hundred nineteen thousand, six hundred forty-three".