1665260165 has 8 divisors (see below), whose sum is σ = 2000492160. Its totient is φ = 1330754832.

The previous prime is 1665260137. The next prime is 1665260173. The reversal of 1665260165 is 5610625661.

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 1665260165 - 2¹² = 1665256069 is a prime.

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, 176609 + ... + 185798.

It is an arithmetic number, because the mean of its divisors is an integer number (250061520).

Almost surely, 2^1665260165 is an apocalyptic number.

It is an amenable number.

1665260165 is a deficient number, since it is larger than the sum of its proper divisors (335231995).

1665260165 is an equidigital number, since it uses as much as digits as its factorization.

1665260165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363331.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1665260165 is about 40807.5993535518. The cubic root of 1665260165 is about 1185.2974892098.

The spelling of 1665260165 in words is "one billion, six hundred sixty-five million, two hundred sixty thousand, one hundred sixty-five".