81769608016 has 20 divisors (see below), whose sum is σ = 158789514400. Its totient is φ = 40791668832.

The previous prime is 81769607873. The next prime is 81769608043. The reversal of 81769608016 is 61080696718.

It is a happy number.

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, 5813706 + ... + 5827753.

It is an arithmetic number, because the mean of its divisors is an integer number (7939475720).

Almost surely, 2^81769608016 is an apocalyptic number.

It is an amenable number.

81769608016 is a deficient number, since it is larger than the sum of its proper divisors (77019906384).

81769608016 is a wasteful number, since it uses less digits than its factorization.

81769608016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11641906 (or 11641900 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 81769608016 in words is "eighty-one billion, seven hundred sixty-nine million, six hundred eight thousand, sixteen".