879505985717 has 2 divisors, whose sum is σ = 879505985718. Its totient is φ = 879505985716.

The previous prime is 879505985651. The next prime is 879505985741. The reversal of 879505985717 is 717589505978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 830269038481 + 49236947236 = 911191^2 + 221894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-879505985717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (879505985767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439752992858 + 439752992859.

It is an arithmetic number, because the mean of its divisors is an integer number (439752992859).

Almost surely, 2^879505985717 is an apocalyptic number.

It is an amenable number.

879505985717 is a deficient number, since it is larger than the sum of its proper divisors (1).

879505985717 is an equidigital number, since it uses as much as digits as its factorization.

879505985717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222264000, while the sum is 71.

The spelling of 879505985717 in words is "eight hundred seventy-nine billion, five hundred five million, nine hundred eighty-five thousand, seven hundred seventeen".