145202665 has 4 divisors (see below), whose sum is σ = 174243204. Its totient is φ = 116162128.

The previous prime is 145202647. The next prime is 145202671. The reversal of 145202665 is 566202541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566202541 = 7873 ⋅71917.

It can be written as a sum of positive squares in 2 ways, for example, as 108430569 + 36772096 = 10413^2 + 6064^2 .

It is a cyclic number.

It is not a de Polignac number, because 145202665 - 2⁵ = 145202633 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14520262 + ... + 14520271.

It is an arithmetic number, because the mean of its divisors is an integer number (43560801).

Almost surely, 2^145202665 is an apocalyptic number.

It is an amenable number.

145202665 is a deficient number, since it is larger than the sum of its proper divisors (29040539).

145202665 is an equidigital number, since it uses as much as digits as its factorization.

145202665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29040538.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 145202665 is about 12050.0068464711. The cubic root of 145202665 is about 525.6034361510.

The spelling of 145202665 in words is "one hundred forty-five million, two hundred two thousand, six hundred sixty-five".