5646608721 has 48 divisors (see below), whose sum is σ = 9179194752. Its totient is φ = 3318796800.

The previous prime is 5646608719. The next prime is 5646608731. The reversal of 5646608721 is 1278066465.

5646608721 is a `hidden beast` number, since 564 + 6 + 6 + 0 + 87 + 2 + 1 = 666.

It is not a de Polignac number, because 5646608721 - 2¹ = 5646608719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5646608731) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2611881 + ... + 2614041.

It is an arithmetic number, because the mean of its divisors is an integer number (191233224).

Almost surely, 2^5646608721 is an apocalyptic number.

It is an amenable number.

5646608721 is a deficient number, since it is larger than the sum of its proper divisors (3532586031).

5646608721 is a wasteful number, since it uses less digits than its factorization.

5646608721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174 (or 3171 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 5646608721 is about 75143.9200534548. The cubic root of 5646608721 is about 1780.7210731085.

The spelling of 5646608721 in words is "five billion, six hundred forty-six million, six hundred eight thousand, seven hundred twenty-one".