71085554897 has 4 divisors (see below), whose sum is σ = 81240634176. Its totient is φ = 60930475620.

The previous prime is 71085554849. The next prime is 71085554921. The reversal of 71085554897 is 79845558017.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79845558017 = 35117 ⋅2273701.

It is not a de Polignac number, because 71085554897 - 2³² = 66790587601 is a prime.

It is a super-2 number, since 2×71085554897² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71085574897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5077539629 + ... + 5077539642.

It is an arithmetic number, because the mean of its divisors is an integer number (20310158544).

Almost surely, 2^71085554897 is an apocalyptic number.

It is an amenable number.

71085554897 is a deficient number, since it is larger than the sum of its proper divisors (10155079279).

71085554897 is a wasteful number, since it uses less digits than its factorization.

71085554897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10155079278.

The product of its (nonzero) digits is 14112000, while the sum is 59.

The spelling of 71085554897 in words is "seventy-one billion, eighty-five million, five hundred fifty-four thousand, eight hundred ninety-seven".