71981974326 has 16 divisors (see below), whose sum is σ = 146324014128. Its totient is φ = 23600647200.

The previous prime is 71981974319. The next prime is 71981974391. The reversal of 71981974326 is 62347918917.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 98335665 + ... + 98336396.

It is an arithmetic number, because the mean of its divisors is an integer number (9145250883).

Almost surely, 2^71981974326 is an apocalyptic number.

71981974326 is an abundant number, since it is smaller than the sum of its proper divisors (74342039802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71981974326 is a wasteful number, since it uses less digits than its factorization.

71981974326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196672127.

The product of its digits is 4572288, while the sum is 57.

The spelling of 71981974326 in words is "seventy-one billion, nine hundred eighty-one million, nine hundred seventy-four thousand, three hundred twenty-six".