716553721 has 8 divisors (see below), whose sum is σ = 798283080. Its totient is φ = 638625792.

The previous prime is 716553713. The next prime is 716553731. The reversal of 716553721 is 127355617.

It can be written as a sum of positive squares in 4 ways, for example, as 2595321 + 713958400 = 1611^2 + 26720^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 716553721 - 2³ = 716553713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (716553701) 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, 949960 + ... + 950713.

It is an arithmetic number, because the mean of its divisors is an integer number (99785385).

Almost surely, 2^716553721 is an apocalyptic number.

It is an amenable number.

716553721 is a deficient number, since it is larger than the sum of its proper divisors (81729359).

716553721 is a wasteful number, since it uses less digits than its factorization.

716553721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900715.

The product of its digits is 44100, while the sum is 37.

The square root of 716553721 is about 26768.5210835414. The cubic root of 716553721 is about 894.8486457956.

The spelling of 716553721 in words is "seven hundred sixteen million, five hundred fifty-three thousand, seven hundred twenty-one".