6658549550879 has 4 divisors (see below), whose sum is σ = 6658554912240. Its totient is φ = 6658544189520.

The previous prime is 6658549550869. The next prime is 6658549550909. The reversal of 6658549550879 is 9780559458566.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6658549550879 - 2⁸ = 6658549550623 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 (6658549550869) 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, 250907 + ... + 3657875.

It is an arithmetic number, because the mean of its divisors is an integer number (1664638728060).

Almost surely, 2^{6658549550879} is an apocalyptic number.

6658549550879 is a deficient number, since it is larger than the sum of its proper divisors (5361361).

6658549550879 is a wasteful number, since it uses less digits than its factorization.

6658549550879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361360.

The product of its (nonzero) digits is 3265920000, while the sum is 77.

The spelling of 6658549550879 in words is "six trillion, six hundred fifty-eight billion, five hundred forty-nine million, five hundred fifty thousand, eight hundred seventy-nine".