717445551861977 has 2 divisors, whose sum is σ = 717445551861978. Its totient is φ = 717445551861976.

The previous prime is 717445551861881. The next prime is 717445551862007. The reversal of 717445551861977 is 779168155544717.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612258805650496 + 105186746211481 = 24743864^2 + 10256059^2 .

It is a cyclic number.

It is not a de Polignac number, because 717445551861977 - 2²⁰ = 717445550813401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 717445551861898 and 717445551861907.

It is not a weakly prime, because it can be changed into another prime (717445551761977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358722775930988 + 358722775930989.

It is an arithmetic number, because the mean of its divisors is an integer number (358722775930989).

Almost surely, 2^{717445551861977} is an apocalyptic number.

It is an amenable number.

717445551861977 is a deficient number, since it is larger than the sum of its proper divisors (1).

717445551861977 is an equidigital number, since it uses as much as digits as its factorization.

717445551861977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2074464000, while the sum is 77.

The spelling of 717445551861977 in words is "seven hundred seventeen trillion, four hundred forty-five billion, five hundred fifty-one million, eight hundred sixty-one thousand, nine hundred seventy-seven".