6660751665 has 32 divisors (see below), whose sum is σ = 10769333760. Its totient is φ = 3515129856.

The previous prime is 6660751633. The next prime is 6660751709. The reversal of 6660751665 is 5661570666.

It is a happy number.

It is not a de Polignac number, because 6660751665 - 2⁵ = 6660751633 is a prime.

It is a super-2 number, since 2×6660751665² = 88731225485600544450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1137816 + ... + 1143654.

It is an arithmetic number, because the mean of its divisors is an integer number (336541680).

Almost surely, 2^6660751665 is an apocalyptic number.

It is an amenable number.

6660751665 is a deficient number, since it is larger than the sum of its proper divisors (4108582095).

6660751665 is a wasteful number, since it uses less digits than its factorization.

6660751665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633.

The product of its (nonzero) digits is 1360800, while the sum is 48.

The square root of 6660751665 is about 81613.4282149696. The cubic root of 6660751665 is about 1881.5152700917.

The spelling of 6660751665 in words is "six billion, six hundred sixty million, seven hundred fifty-one thousand, six hundred sixty-five".