6660165638 has 16 divisors (see below), whose sum is σ = 11427861024. Its totient is φ = 2851748160.

The previous prime is 6660165613. The next prime is 6660165653. The reversal of 6660165638 is 8365610666.

It is a junction number, because it is equal to n+sod(n) for n = 6660165592 and 6660165601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201473 + ... + 232188.

It is an arithmetic number, because the mean of its divisors is an integer number (714241314).

Almost surely, 2^6660165638 is an apocalyptic number.

6660165638 is a deficient number, since it is larger than the sum of its proper divisors (4767695386).

6660165638 is a wasteful number, since it uses less digits than its factorization.

6660165638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434767.

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 6660165638 is about 81609.8378750993. The cubic root of 6660165638 is about 1881.4600885775.

The spelling of 6660165638 in words is "six billion, six hundred sixty million, one hundred sixty-five thousand, six hundred thirty-eight".