6605999987 has 8 divisors (see below), whose sum is σ = 6920299200. Its totient is φ = 6297467904.

The previous prime is 6605999969. The next prime is 6605999989. The reversal of 6605999987 is 7899995066.

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

It is a cyclic number.

It is not a de Polignac number, because 6605999987 - 2¹⁴ = 6605983603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6605999989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1439438 + ... + 1444019.

It is an arithmetic number, because the mean of its divisors is an integer number (865037400).

Almost surely, 2^6605999987 is an apocalyptic number.

6605999987 is a deficient number, since it is larger than the sum of its proper divisors (314299213).

6605999987 is a wasteful number, since it uses less digits than its factorization.

6605999987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883565.

The product of its (nonzero) digits is 66134880, while the sum is 68.

The square root of 6605999987 is about 81277.3030248913. The cubic root of 6605999987 is about 1876.3456993860.

The spelling of 6605999987 in words is "six billion, six hundred five million, nine hundred ninety-nine thousand, nine hundred eighty-seven".