1665350565 has 16 divisors (see below), whose sum is σ = 2665656000. Its totient is φ = 887821952.

The previous prime is 1665350563. The next prime is 1665350591. The reversal of 1665350565 is 5650535661.

1665350565 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1665350565 - 2¹ = 1665350563 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665350563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17161 + ... + 60209.

It is an arithmetic number, because the mean of its divisors is an integer number (166603500).

Almost surely, 2^1665350565 is an apocalyptic number.

1665350565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1665350565 is a deficient number, since it is larger than the sum of its proper divisors (1000305435).

1665350565 is a wasteful number, since it uses less digits than its factorization.

1665350565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45636.

The product of its (nonzero) digits is 405000, while the sum is 42.

The square root of 1665350565 is about 40808.7069753502. The cubic root of 1665350565 is about 1185.3189371005.

The spelling of 1665350565 in words is "one billion, six hundred sixty-five million, three hundred fifty thousand, five hundred sixty-five".