717689817961 has 2 divisors, whose sum is σ = 717689817962. Its totient is φ = 717689817960.

The previous prime is 717689817913. The next prime is 717689817979. The reversal of 717689817961 is 169718986717.

717689817961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412107505936 + 305582312025 = 641956^2 + 552795^2 .

It is a cyclic number.

It is not a de Polignac number, because 717689817961 - 2¹⁵ = 717689785193 is a prime.

It is not a weakly prime, because it can be changed into another prime (717689217961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358844908980 + 358844908981.

It is an arithmetic number, because the mean of its divisors is an integer number (358844908981).

Almost surely, 2^717689817961 is an apocalyptic number.

It is an amenable number.

717689817961 is a deficient number, since it is larger than the sum of its proper divisors (1).

717689817961 is an equidigital number, since it uses as much as digits as its factorization.

717689817961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64012032, while the sum is 70.

The spelling of 717689817961 in words is "seven hundred seventeen billion, six hundred eighty-nine million, eight hundred seventeen thousand, nine hundred sixty-one".