71121263445 has 12 divisors (see below), whose sum is σ = 123276856716. Its totient is φ = 37931340480.

The previous prime is 71121263441. The next prime is 71121263501. The reversal of 71121263445 is 54436212117.

71121263445 is a `hidden beast` number, since 7 + 1 + 1 + 2 + 12 + 634 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12656925009 + 58464338436 = 112503^2 + 241794^2 .

It is not a de Polignac number, because 71121263445 - 2² = 71121263441 is a prime.

It is a super-2 number, since 2×71121263445² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71121263441) 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 11 ways as a sum of consecutive naturals, for example, 790236216 + ... + 790236305.

It is an arithmetic number, because the mean of its divisors is an integer number (10273071393).

Almost surely, 2^71121263445 is an apocalyptic number.

It is an amenable number.

71121263445 is a deficient number, since it is larger than the sum of its proper divisors (52155593271).

71121263445 is a wasteful number, since it uses less digits than its factorization.

71121263445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580472532 (or 1580472529 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The spelling of 71121263445 in words is "seventy-one billion, one hundred twenty-one million, two hundred sixty-three thousand, four hundred forty-five".