705671688517 has 4 divisors (see below), whose sum is σ = 712946654476. Its totient is φ = 698396722560.

The previous prime is 705671688499. The next prime is 705671688581. The reversal of 705671688517 is 715886176507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715886176507 = 929 ⋅770598683.

It can be written as a sum of positive squares in 2 ways, for example, as 100596174561 + 605075513956 = 317169^2 + 777866^2 .

It is a cyclic number.

It is not a de Polignac number, because 705671688517 - 2²⁷ = 705537470789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705671688017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3637482834 + ... + 3637483027.

It is an arithmetic number, because the mean of its divisors is an integer number (178236663619).

Almost surely, 2^705671688517 is an apocalyptic number.

It is an amenable number.

705671688517 is a deficient number, since it is larger than the sum of its proper divisors (7274965959).

705671688517 is an equidigital number, since it uses as much as digits as its factorization.

705671688517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7274965958.

The product of its (nonzero) digits is 19756800, while the sum is 61.

The spelling of 705671688517 in words is "seven hundred five billion, six hundred seventy-one million, six hundred eighty-eight thousand, five hundred seventeen".