711771721085 has 4 divisors (see below), whose sum is σ = 854126065308. Its totient is φ = 569417376864.

The previous prime is 711771721049. The next prime is 711771721093. The reversal of 711771721085 is 580127177117.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 321622825924 + 390148895161 = 567118^2 + 624619^2 .

It is a cyclic number.

It is not a de Polignac number, because 711771721085 - 2³⁶ = 643052244349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 71177172104 + ... + 71177172113.

It is an arithmetic number, because the mean of its divisors is an integer number (213531516327).

Almost surely, 2^711771721085 is an apocalyptic number.

It is an amenable number.

711771721085 is a deficient number, since it is larger than the sum of its proper divisors (142354344223).

711771721085 is a wasteful number, since it uses less digits than its factorization.

711771721085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142354344222.

The product of its (nonzero) digits is 192080, while the sum is 47.

The spelling of 711771721085 in words is "seven hundred eleven billion, seven hundred seventy-one million, seven hundred twenty-one thousand, eighty-five".