3720566321 has 4 divisors (see below), whose sum is σ = 3724471332. Its totient is φ = 3716661312.

The previous prime is 3720566299. The next prime is 3720566327. The reversal of 3720566321 is 1236650273.

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 914215696 + 2806350625 = 30236^2 + 52975^2 .

It is a cyclic number.

It is not a de Polignac number, because 3720566321 - 2²² = 3716372017 is a prime.

It is a super-2 number, since 2×3720566321² = 27685227497918950082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3720566327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951076 + ... + 1952981.

It is an arithmetic number, because the mean of its divisors is an integer number (931117833).

Almost surely, 2^3720566321 is an apocalyptic number.

It is an amenable number.

3720566321 is a deficient number, since it is larger than the sum of its proper divisors (3905011).

3720566321 is an equidigital number, since it uses as much as digits as its factorization.

3720566321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905010.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 3720566321 is about 60996.4451505168. The cubic root of 3720566321 is about 1549.5408034118.

The spelling of 3720566321 in words is "three billion, seven hundred twenty million, five hundred sixty-six thousand, three hundred twenty-one".