145611665 has 4 divisors (see below), whose sum is σ = 174734004. Its totient is φ = 116489328.

The previous prime is 145611607. The next prime is 145611701. The reversal of 145611665 is 566116541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84787264 + 60824401 = 9208^2 + 7799^2 .

It is a cyclic number.

It is not a de Polignac number, because 145611665 - 2⁶ = 145611601 is a prime.

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, 14561162 + ... + 14561171.

It is an arithmetic number, because the mean of its divisors is an integer number (43683501).

Almost surely, 2^145611665 is an apocalyptic number.

It is an amenable number.

145611665 is a deficient number, since it is larger than the sum of its proper divisors (29122339).

145611665 is an equidigital number, since it uses as much as digits as its factorization.

145611665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29122338.

The product of its digits is 21600, while the sum is 35.

The square root of 145611665 is about 12066.9658572485. The cubic root of 145611665 is about 526.0964718214.

The spelling of 145611665 in words is "one hundred forty-five million, six hundred eleven thousand, six hundred sixty-five".