81708734711 has 4 divisors (see below), whose sum is σ = 81724821024. Its totient is φ = 81692648400.

The previous prime is 81708734707. The next prime is 81708734717. The reversal of 81708734711 is 11743780718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81708734711 - 2² = 81708734707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81708734717) 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, 8035535 + ... + 8045696.

It is an arithmetic number, because the mean of its divisors is an integer number (20431205256).

Almost surely, 2^81708734711 is an apocalyptic number.

81708734711 is a deficient number, since it is larger than the sum of its proper divisors (16086313).

81708734711 is a wasteful number, since it uses less digits than its factorization.

81708734711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16086312.

The product of its (nonzero) digits is 263424, while the sum is 47.

The spelling of 81708734711 in words is "eighty-one billion, seven hundred eight million, seven hundred thirty-four thousand, seven hundred eleven".