4546638721 has 8 divisors (see below), whose sum is σ = 4625121384. Its totient is φ = 4468283520.

The previous prime is 4546638683. The next prime is 4546638737. The reversal of 4546638721 is 1278366454.

It can be written as a sum of positive squares in 4 ways, for example, as 25959025 + 4520679696 = 5095^2 + 67236^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4546638721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4546638751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41535 + ... + 104011.

It is an arithmetic number, because the mean of its divisors is an integer number (578140173).

Almost surely, 2^4546638721 is an apocalyptic number.

It is an amenable number.

4546638721 is a deficient number, since it is larger than the sum of its proper divisors (78482663).

4546638721 is a wasteful number, since it uses less digits than its factorization.

4546638721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63731.

The product of its digits is 967680, while the sum is 46.

The square root of 4546638721 is about 67428.7677553135. The cubic root of 4546638721 is about 1656.6476498988.

The spelling of 4546638721 in words is "four billion, five hundred forty-six million, six hundred thirty-eight thousand, seven hundred twenty-one".