81711634328 has 16 divisors (see below), whose sum is σ = 153253994280. Its totient is φ = 40843902528.

The previous prime is 81711634309. The next prime is 81711634343. The reversal of 81711634328 is 82343611718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460150 + ... + 1515077.

Almost surely, 2^81711634328 is an apocalyptic number.

It is an amenable number.

81711634328 is a deficient number, since it is larger than the sum of its proper divisors (71542359952).

81711634328 is a wasteful number, since it uses less digits than its factorization.

81711634328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978666 (or 2978662 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The spelling of 81711634328 in words is "eighty-one billion, seven hundred eleven million, six hundred thirty-four thousand, three hundred twenty-eight".