1665665365 has 32 divisors (see below), whose sum is σ = 2466213120. Its totient is φ = 1051674624.

The previous prime is 1665665363. The next prime is 1665665387. The reversal of 1665665365 is 5635665661.

It is not a de Polignac number, because 1665665365 - 2¹ = 1665665363 is a prime.

It is a super-2 number, since 2×1665665365² = 5548882216321166450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665665363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186277 + ... + 195013.

It is an arithmetic number, because the mean of its divisors is an integer number (77069160).

Almost surely, 2^1665665365 is an apocalyptic number.

It is an amenable number.

1665665365 is a deficient number, since it is larger than the sum of its proper divisors (800547755).

1665665365 is a wasteful number, since it uses less digits than its factorization.

1665665365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9181.

The product of its digits is 2916000, while the sum is 49.

The square root of 1665665365 is about 40812.5638131201. The cubic root of 1665665365 is about 1185.3936190524.

The spelling of 1665665365 in words is "one billion, six hundred sixty-five million, six hundred sixty-five thousand, three hundred sixty-five".