6661988058 has 32 divisors (see below), whose sum is σ = 14539875840. Its totient is φ = 2018141360.

The previous prime is 6661988057. The next prime is 6661988063. The reversal of 6661988058 is 8508891666.

It is a super-3 number, since 3×6661988058³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 6661987989 and 6661988007.

It is not an unprimeable number, because it can be changed into a prime (6661988051) 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 15 ways as a sum of consecutive naturals, for example, 218473 + ... + 247091.

It is an arithmetic number, because the mean of its divisors is an integer number (454371120).

Almost surely, 2^6661988058 is an apocalyptic number.

6661988058 is an abundant number, since it is smaller than the sum of its proper divisors (7877887782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661988058 is a wasteful number, since it uses less digits than its factorization.

6661988058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32162.

The product of its (nonzero) digits is 4976640, while the sum is 57.

The square root of 6661988058 is about 81621.0025544896. The cubic root of 6661988058 is about 1881.6316807964.

The spelling of 6661988058 in words is "six billion, six hundred sixty-one million, nine hundred eighty-eight thousand, fifty-eight".