1665101121 has 8 divisors (see below), whose sum is σ = 2280138624. Its totient is φ = 1080065520.

The previous prime is 1665101117. The next prime is 1665101173. The reversal of 1665101121 is 1211015661.

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

It is not a de Polignac number, because 1665101121 - 2² = 1665101117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1665101091 and 1665101100.

It is not an unprimeable number, because it can be changed into a prime (1665101111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7500345 + ... + 7500566.

It is an arithmetic number, because the mean of its divisors is an integer number (285017328).

Almost surely, 2^1665101121 is an apocalyptic number.

It is an amenable number.

1665101121 is a deficient number, since it is larger than the sum of its proper divisors (615037503).

1665101121 is a wasteful number, since it uses less digits than its factorization.

1665101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15000951.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 1665101121 is about 40805.6506013567. The cubic root of 1665101121 is about 1185.2597532732.

Adding to 1665101121 its reverse (1211015661), we get a palindrome (2876116782).

The spelling of 1665101121 in words is "one billion, six hundred sixty-five million, one hundred one thousand, one hundred twenty-one".