4505617721 has 4 divisors (see below), whose sum is σ = 4915219344. Its totient is φ = 4096016100.

The previous prime is 4505617691. The next prime is 4505617759. The reversal of 4505617721 is 1277165054.

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 de Polignac number, because none of the positive numbers 2^k-4505617721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4505617621) 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, 204800795 + ... + 204800816.

It is an arithmetic number, because the mean of its divisors is an integer number (1228804836).

Almost surely, 2^4505617721 is an apocalyptic number.

It is an amenable number.

4505617721 is a deficient number, since it is larger than the sum of its proper divisors (409601623).

4505617721 is a wasteful number, since it uses less digits than its factorization.

4505617721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409601622.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 4505617721 is about 67123.8982851860. The cubic root of 4505617721 is about 1651.6503500962.

It can be divided in two parts, 4505 and 617721, that added together give a palindrome (622226).

The spelling of 4505617721 in words is "four billion, five hundred five million, six hundred seventeen thousand, seven hundred twenty-one".