52221665 has 4 divisors (see below), whose sum is σ = 62666004. Its totient is φ = 41777328.

The previous prime is 52221649. The next prime is 52221677. The reversal of 52221665 is 56612225.

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 13184161 + 39037504 = 3631^2 + 6248^2 .

It is a cyclic number.

It is not a de Polignac number, because 52221665 - 2⁴ = 52221649 is a prime.

It is a Duffinian number.

It is a Curzon 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, 5222162 + ... + 5222171.

It is an arithmetic number, because the mean of its divisors is an integer number (15666501).

Almost surely, 2^52221665 is an apocalyptic number.

It is an amenable number.

52221665 is a deficient number, since it is larger than the sum of its proper divisors (10444339).

52221665 is a wasteful number, since it uses less digits than its factorization.

52221665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10444338.

The product of its digits is 7200, while the sum is 29.

The square root of 52221665 is about 7226.4559086734. The cubic root of 52221665 is about 373.7807273686.

The spelling of 52221665 in words is "fifty-two million, two hundred twenty-one thousand, six hundred sixty-five".