43055665 has 4 divisors (see below), whose sum is σ = 51666804. Its totient is φ = 34444528.

The previous prime is 43055659. The next prime is 43055671. The reversal of 43055665 is 56655034.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56655034 = 2 ⋅28327517.

It is an interprime number because it is at equal distance from previous prime (43055659) and next prime (43055671).

It can be written as a sum of positive squares in 2 ways, for example, as 17239104 + 25816561 = 4152^2 + 5081^2 .

It is a cyclic number.

It is not a de Polignac number, because 43055665 - 2¹⁷ = 42924593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43055665.

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, 4305562 + ... + 4305571.

It is an arithmetic number, because the mean of its divisors is an integer number (12916701).

Almost surely, 2^43055665 is an apocalyptic number.

It is an amenable number.

43055665 is a deficient number, since it is larger than the sum of its proper divisors (8611139).

43055665 is an equidigital number, since it uses as much as digits as its factorization.

43055665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8611138.

The product of its (nonzero) digits is 54000, while the sum is 34.

The square root of 43055665 is about 6561.6815680129. The cubic root of 43055665 is about 350.4909165515.

The spelling of 43055665 in words is "forty-three million, fifty-five thousand, six hundred sixty-five".