1660661001165 has 64 divisors (see below), whose sum is σ = 2905482258432. Its totient is φ = 806315212800.

The previous prime is 1660661001163. The next prime is 1660661001173. The reversal of 1660661001165 is 5611001660661.

It is not a de Polignac number, because 1660661001165 - 2¹ = 1660661001163 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660661001163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17034099 + ... + 17131311.

It is an arithmetic number, because the mean of its divisors is an integer number (45398160288).

Almost surely, 2^{1660661001165} is an apocalyptic number.

1660661001165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1660661001165 is a deficient number, since it is larger than the sum of its proper divisors (1244821257267).

1660661001165 is a wasteful number, since it uses less digits than its factorization.

1660661001165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99430.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 1660661001165 in words is "one trillion, six hundred sixty billion, six hundred sixty-one million, one thousand, one hundred sixty-five".