81776711 has 4 divisors (see below), whose sum is σ = 81795000. Its totient is φ = 81758424.

The previous prime is 81776701. The next prime is 81776719. The reversal of 81776711 is 11767718.

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 81776711 - 2¹⁸ = 81514567 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 (81776719) 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, 2540 + ... + 13038.

It is an arithmetic number, because the mean of its divisors is an integer number (20448750).

Almost surely, 2^81776711 is an apocalyptic number.

81776711 is a deficient number, since it is larger than the sum of its proper divisors (18289).

81776711 is a wasteful number, since it uses less digits than its factorization.

81776711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18288.

The product of its digits is 16464, while the sum is 38.

The square root of 81776711 is about 9043.0476610488. The cubic root of 81776711 is about 434.0534506998.

The spelling of 81776711 in words is "eighty-one million, seven hundred seventy-six thousand, seven hundred eleven".