718017030721 has 4 divisors (see below), whose sum is σ = 721152476500. Its totient is φ = 714881584944.

The previous prime is 718017030707. The next prime is 718017030751. The reversal of 718017030721 is 127030710817.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 506751778225 + 211265252496 = 711865^2 + 459636^2 .

It is a cyclic number.

It is not a de Polignac number, because 718017030721 - 2¹³ = 718017022529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718017030751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1567722546 + ... + 1567723003.

It is an arithmetic number, because the mean of its divisors is an integer number (180288119125).

Almost surely, 2^718017030721 is an apocalyptic number.

It is an amenable number.

718017030721 is a deficient number, since it is larger than the sum of its proper divisors (3135445779).

718017030721 is a wasteful number, since it uses less digits than its factorization.

718017030721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135445778.

The product of its (nonzero) digits is 16464, while the sum is 37.

The spelling of 718017030721 in words is "seven hundred eighteen billion, seventeen million, thirty thousand, seven hundred twenty-one".