1001666165 has 8 divisors (see below), whose sum is σ = 1203369048. Its totient is φ = 800419840.

The previous prime is 1001666143. The next prime is 1001666173. The reversal of 1001666165 is 5616661001.

It can be written as a sum of positive squares in 4 ways, for example, as 14638276 + 987027889 = 3826^2 + 31417^2 .

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

It is not a de Polignac number, because 1001666165 - 2¹⁰ = 1001665141 is a prime.

It is a super-2 number, since 2×1001666165² = 2006670212211614450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109292 + ... + 118101.

It is an arithmetic number, because the mean of its divisors is an integer number (150421131).

Almost surely, 2^1001666165 is an apocalyptic number.

It is an amenable number.

1001666165 is a deficient number, since it is larger than the sum of its proper divisors (201702883).

1001666165 is an equidigital number, since it uses as much as digits as its factorization.

1001666165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228279.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1001666165 is about 31649.1100190827. The cubic root of 1001666165 is about 1000.5550801623. Note that the first 3 decimals are identical.

The spelling of 1001666165 in words is "one billion, one million, six hundred sixty-six thousand, one hundred sixty-five".