4664317500721 has 6 divisors (see below), whose sum is σ = 4780856071766. Its totient is φ = 4550553657600.

The previous prime is 4664317500709. The next prime is 4664317500743. The reversal of 4664317500721 is 1270057134664.

It can be written as a sum of positive squares in 3 ways, for example, as 1281568900096 + 3382748600625 = 1132064^2 + 1839225^2 .

It is not a de Polignac number, because 4664317500721 - 2⁷ = 4664317500593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4664317503721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1387362240 + ... + 1387365601.

Almost surely, 2^{4664317500721} is an apocalyptic number.

4664317500721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4664317500721 is a deficient number, since it is larger than the sum of its proper divisors (116538571045).

4664317500721 is an equidigital number, since it uses as much as digits as its factorization.

4664317500721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774727923 (or 2774727882 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 4664317500721 in words is "four trillion, six hundred sixty-four billion, three hundred seventeen million, five hundred thousand, seven hundred twenty-one".