71156744681 has 4 divisors (see below), whose sum is σ = 77625539664. Its totient is φ = 64687949700.

The previous prime is 71156744587. The next prime is 71156744683. The reversal of 71156744681 is 18644765117.

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.

It is not a de Polignac number, because 71156744681 - 2³⁴ = 53976875497 is a prime.

It is a super-2 number, since 2×71156744681² (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 (71156744683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3234397475 + ... + 3234397496.

It is an arithmetic number, because the mean of its divisors is an integer number (19406384916).

Almost surely, 2^71156744681 is an apocalyptic number.

It is an amenable number.

71156744681 is a deficient number, since it is larger than the sum of its proper divisors (6468794983).

71156744681 is a wasteful number, since it uses less digits than its factorization.

71156744681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6468794982.

The product of its digits is 1128960, while the sum is 50.

The spelling of 71156744681 in words is "seventy-one billion, one hundred fifty-six million, seven hundred forty-four thousand, six hundred eighty-one".