80656121771865 has 24 divisors (see below), whose sum is σ = 139804451549568. Its totient is φ = 43016442233760.

The previous prime is 80656121771809. The next prime is 80656121771873. The reversal of 80656121771865 is 56817712165608.

It is a happy number.

80656121771865 is a `hidden beast` number, since 8 + 0 + 6 + 5 + 612 + 1 + 7 + 7 + 1 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 80656121771865 - 2¹⁰ = 80656121770841 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9874320 + ... + 16087710.

It is an arithmetic number, because the mean of its divisors is an integer number (5825185481232).

Almost surely, 2^{80656121771865} is an apocalyptic number.

It is an amenable number.

80656121771865 is a deficient number, since it is larger than the sum of its proper divisors (59148329777703).

80656121771865 is a wasteful number, since it uses less digits than its factorization.

80656121771865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6501869 (or 6501866 counting only the distinct ones).

The product of its (nonzero) digits is 33868800, while the sum is 63.

The spelling of 80656121771865 in words is "eighty trillion, six hundred fifty-six billion, one hundred twenty-one million, seven hundred seventy-one thousand, eight hundred sixty-five".