145665 has 32 divisors (see below), whose sum is σ = 282240. Its totient is φ = 70848.

The previous prime is 145661. The next prime is 145679. The reversal of 145665 is 566541.

It is a happy number.

It is not a de Polignac number, because 145665 - 2² = 145661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

145665 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 145665.

It is not an unprimeable number, because it can be changed into a prime (145661) 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, 1714 + ... + 1796.

It is an arithmetic number, because the mean of its divisors is an integer number (8820).

2¹⁴⁵⁶⁶⁵ is an apocalyptic number.

145665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145665 is a deficient number, since it is larger than the sum of its proper divisors (136575).

145665 is a wasteful number, since it uses less digits than its factorization.

145665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 104 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 145665 is about 381.6608442060. The cubic root of 145665 is about 52.6160697285.

It can be divided in two parts, 1456 and 65, that added together give a square (1521 = 39²).

The spelling of 145665 in words is "one hundred forty-five thousand, six hundred sixty-five".