6691439558 has 8 divisors (see below), whose sum is σ = 10050743640. Its totient is φ = 3341191680.

The previous prime is 6691439549. The next prime is 6691439597. The reversal of 6691439558 is 8559341966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2262203 + ... + 2265158.

It is an arithmetic number, because the mean of its divisors is an integer number (1256342955).

Almost surely, 2^6691439558 is an apocalyptic number.

6691439558 is a deficient number, since it is larger than the sum of its proper divisors (3359304082).

6691439558 is a wasteful number, since it uses less digits than its factorization.

6691439558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528102.

The product of its digits is 6998400, while the sum is 56.

The square root of 6691439558 is about 81801.2197830815. The cubic root of 6691439558 is about 1884.4003944859.

The spelling of 6691439558 in words is "six billion, six hundred ninety-one million, four hundred thirty-nine thousand, five hundred fifty-eight".