718916561 has 8 divisors (see below), whose sum is σ = 785144448. Its totient is φ = 652834000.

The previous prime is 718916557. The next prime is 718916573. The reversal of 718916561 is 165619817.

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 718916561 - 2² = 718916557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (718916501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25850 + ... + 45891.

It is an arithmetic number, because the mean of its divisors is an integer number (98143056).

Almost surely, 2^718916561 is an apocalyptic number.

It is an amenable number.

718916561 is a deficient number, since it is larger than the sum of its proper divisors (66227887).

718916561 is a wasteful number, since it uses less digits than its factorization.

718916561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72663.

The product of its digits is 90720, while the sum is 44.

The square root of 718916561 is about 26812.6194356314. The cubic root of 718916561 is about 895.8311561531.

The spelling of 718916561 in words is "seven hundred eighteen million, nine hundred sixteen thousand, five hundred sixty-one".