3643221473 has 4 divisors (see below), whose sum is σ = 3650641968. Its totient is φ = 3635800980.

The previous prime is 3643221467. The next prime is 3643221487. The reversal of 3643221473 is 3741223463.

3643221473 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3643221473 - 2⁴ = 3643221457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3643221973) 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, 3709511 + ... + 3710492.

It is an arithmetic number, because the mean of its divisors is an integer number (912660492).

Almost surely, 2^3643221473 is an apocalyptic number.

It is an amenable number.

3643221473 is a deficient number, since it is larger than the sum of its proper divisors (7420495).

3643221473 is an equidigital number, since it uses as much as digits as its factorization.

3643221473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7420494.

The product of its digits is 72576, while the sum is 35.

The square root of 3643221473 is about 60359.1043091264. The cubic root of 3643221473 is about 1538.7280036001.

The spelling of 3643221473 in words is "three billion, six hundred forty-three million, two hundred twenty-one thousand, four hundred seventy-three".