81335677867 has 4 divisors (see below), whose sum is σ = 81369984616. Its totient is φ = 81301371120.

The previous prime is 81335677859. The next prime is 81335677873. The reversal of 81335677867 is 76877653318.

It is a happy number.

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 81335677867 - 2³ = 81335677859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81335677807) 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, 17149818 + ... + 17154559.

It is an arithmetic number, because the mean of its divisors is an integer number (20342496154).

Almost surely, 2^81335677867 is an apocalyptic number.

81335677867 is a deficient number, since it is larger than the sum of its proper divisors (34306749).

81335677867 is a wasteful number, since it uses less digits than its factorization.

81335677867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34306748.

The product of its digits is 35562240, while the sum is 61.

The spelling of 81335677867 in words is "eighty-one billion, three hundred thirty-five million, six hundred seventy-seven thousand, eight hundred sixty-seven".