720595556641 has 3 divisors (see below), whose sum is σ = 720596405521. Its totient is φ = 720594707762.

The previous prime is 720595556609. The next prime is 720595556663. The reversal of 720595556641 is 146655595027.

The square root of 720595556641 is 848879.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 146655595027 = 41213 ⋅3558479.

It is not a de Polignac number, because 720595556641 - 2⁵ = 720595556609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720595556671) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 424440 + ... + 1273318.

Almost surely, 2^720595556641 is an apocalyptic number.

720595556641 is the 848879-th square number.

720595556641 is the 424440-th centered octagonal number.

It is an amenable number.

720595556641 is a deficient number, since it is larger than the sum of its proper divisors (848880).

720595556641 is an frugal number, since it uses more digits than its factorization.

720595556641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697758 (or 848879 counting only the distinct ones).

The product of its (nonzero) digits is 11340000, while the sum is 55.

The spelling of 720595556641 in words is "seven hundred twenty billion, five hundred ninety-five million, five hundred fifty-six thousand, six hundred forty-one".