1665510661003 has 8 divisors (see below), whose sum is σ = 1903451274720. Its totient is φ = 1427572677120.

The previous prime is 1665510660953. The next prime is 1665510661057. The reversal of 1665510661003 is 3001660155661.

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 1665510661003 - 2²⁹ = 1664973790091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665510661603) 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, 967353 + ... + 2065621.

It is an arithmetic number, because the mean of its divisors is an integer number (237931409340).

Almost surely, 2^{1665510661003} is an apocalyptic number.

1665510661003 is a deficient number, since it is larger than the sum of its proper divisors (237940613717).

1665510661003 is a wasteful number, since it uses less digits than its factorization.

1665510661003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314917.

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 1665510661003 in words is "one trillion, six hundred sixty-five billion, five hundred ten million, six hundred sixty-one thousand, three".