717990159649 has 81 divisors (see below), whose sum is σ = 924815643507. Its totient is φ = 555667203168.

The previous prime is 717990159631. The next prime is 717990159661. The reversal of 717990159649 is 946951099717.

The square root of 717990159649 is 847343.

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

It can be written as a sum of positive squares in only one way, i.e., 123752686225 + 594237473424 = 351785^2 + 770868^2 .

It is not a de Polignac number, because 717990159649 - 2⁵ = 717990159617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (717990150649) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2592022099 + ... + 2592022375.

Almost surely, 2^717990159649 is an apocalyptic number.

717990159649 is the 847343-rd square number.

717990159649 is the 423672-nd centered octagonal number.

It is an amenable number.

717990159649 is a deficient number, since it is larger than the sum of its proper divisors (206825483858).

717990159649 is an equidigital number, since it uses as much as digits as its factorization.

717990159649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 38578680, while the sum is 67.

The spelling of 717990159649 in words is "seven hundred seventeen billion, nine hundred ninety million, one hundred fifty-nine thousand, six hundred forty-nine".