6659889577 has 4 divisors (see below), whose sum is σ = 7265334096. Its totient is φ = 6054445060.

The previous prime is 6659889563. The next prime is 6659889589. The reversal of 6659889577 is 7759889566.

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 a de Polignac number, because none of the positive numbers 2^k-6659889577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6659889517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302722243 + ... + 302722264.

It is an arithmetic number, because the mean of its divisors is an integer number (1816333524).

Almost surely, 2^6659889577 is an apocalyptic number.

It is an amenable number.

6659889577 is a deficient number, since it is larger than the sum of its proper divisors (605444519).

6659889577 is a wasteful number, since it uses less digits than its factorization.

6659889577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605444518.

The product of its digits is 228614400, while the sum is 70.

The square root of 6659889577 is about 81608.1465112399. The cubic root of 6659889577 is about 1881.4340929812.

The spelling of 6659889577 in words is "six billion, six hundred fifty-nine million, eight hundred eighty-nine thousand, five hundred seventy-seven".