4645661321 has 4 divisors (see below), whose sum is σ = 5309327232. Its totient is φ = 3981995412.

The previous prime is 4645661287. The next prime is 4645661341. The reversal of 4645661321 is 1231665464.

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 a de Polignac number, because none of the positive numbers 2^k-4645661321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4645661341) 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, 331832945 + ... + 331832958.

It is an arithmetic number, because the mean of its divisors is an integer number (1327331808).

Almost surely, 2^4645661321 is an apocalyptic number.

It is an amenable number.

4645661321 is a deficient number, since it is larger than the sum of its proper divisors (663665911).

4645661321 is an equidigital number, since it uses as much as digits as its factorization.

4645661321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663665910.

The product of its digits is 103680, while the sum is 38.

The square root of 4645661321 is about 68159.0883228348. The cubic root of 4645661321 is about 1668.5882532826.

The spelling of 4645661321 in words is "four billion, six hundred forty-five million, six hundred sixty-one thousand, three hundred twenty-one".