71981042361 has 16 divisors (see below), whose sum is σ = 99297826560. Its totient is φ = 46326264320.

The previous prime is 71981042291. The next prime is 71981042369. The reversal of 71981042361 is 16324018917.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 71981042361 - 2²¹ = 71978945209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71981042369) 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 15 ways as a sum of consecutive naturals, for example, 627721 + ... + 733481.

It is an arithmetic number, because the mean of its divisors is an integer number (6206114160).

Almost surely, 2^71981042361 is an apocalyptic number.

It is an amenable number.

71981042361 is a deficient number, since it is larger than the sum of its proper divisors (27316784199).

71981042361 is a wasteful number, since it uses less digits than its factorization.

71981042361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113616.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 71981042361 in words is "seventy-one billion, nine hundred eighty-one million, forty-two thousand, three hundred sixty-one".