1445668205 has 4 divisors (see below), whose sum is σ = 1734801852. Its totient is φ = 1156534560.

The previous prime is 1445668201. The next prime is 1445668223. The reversal of 1445668205 is 5028665441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5028665441 = 12821 ⋅392221.

It can be written as a sum of positive squares in 2 ways, for example, as 833303689 + 612364516 = 28867^2 + 24746^2 .

It is not a de Polignac number, because 1445668205 - 2² = 1445668201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445668201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144566816 + ... + 144566825.

It is an arithmetic number, because the mean of its divisors is an integer number (433700463).

Almost surely, 2^1445668205 is an apocalyptic number.

It is an amenable number.

1445668205 is a deficient number, since it is larger than the sum of its proper divisors (289133647).

1445668205 is an equidigital number, since it uses as much as digits as its factorization.

1445668205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289133646.

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 1445668205 is about 38021.9437299042. The cubic root of 1445668205 is about 1130.7229573654.

The spelling of 1445668205 in words is "one billion, four hundred forty-five million, six hundred sixty-eight thousand, two hundred five".