145668805 has 4 divisors (see below), whose sum is σ = 174802572. Its totient is φ = 116535040.

The previous prime is 145668781. The next prime is 145668833. The reversal of 145668805 is 508866541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508866541 = 67 ⋅7595023.

It can be written as a sum of positive squares in 2 ways, for example, as 26553409 + 119115396 = 5153^2 + 10914^2 .

It is not a de Polignac number, because 145668805 - 2⁵ = 145668773 is a prime.

It is a Duffinian number.

It is a congruent 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, 14566876 + ... + 14566885.

It is an arithmetic number, because the mean of its divisors is an integer number (43700643).

Almost surely, 2^145668805 is an apocalyptic number.

It is an amenable number.

145668805 is a deficient number, since it is larger than the sum of its proper divisors (29133767).

145668805 is an equidigital number, since it uses as much as digits as its factorization.

145668805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29133766.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 145668805 is about 12069.3332458757. Note that the first 3 decimals coincide. The cubic root of 145668805 is about 526.1652786282.

The spelling of 145668805 in words is "one hundred forty-five million, six hundred sixty-eight thousand, eight hundred five".