4551606721 has 8 divisors (see below), whose sum is σ = 4650297344. Its totient is φ = 4453898400.

The previous prime is 4551606691. The next prime is 4551606733. The reversal of 4551606721 is 1276061554.

It is a happy number.

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-4551606721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4551604721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236205 + ... + 254746.

It is an arithmetic number, because the mean of its divisors is an integer number (581287168).

Almost surely, 2^4551606721 is an apocalyptic number.

It is an amenable number.

4551606721 is a deficient number, since it is larger than the sum of its proper divisors (98690623).

4551606721 is a wasteful number, since it uses less digits than its factorization.

4551606721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491151.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 4551606721 is about 67465.5965733647. The cubic root of 4551606721 is about 1657.2508229382.

The spelling of 4551606721 in words is "four billion, five hundred fifty-one million, six hundred six thousand, seven hundred twenty-one".