80656673 has 4 divisors (see below), whose sum is σ = 80722500. Its totient is φ = 80590848.

The previous prime is 80656669. The next prime is 80656679. The reversal of 80656673 is 37665608.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45468049 + 35188624 = 6743^2 + 5932^2 .

It is a cyclic number.

It is not a de Polignac number, because 80656673 - 2² = 80656669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80656673.

It is not an unprimeable number, because it can be changed into a prime (80656679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31040 + ... + 33537.

It is an arithmetic number, because the mean of its divisors is an integer number (20180625).

Almost surely, 2^80656673 is an apocalyptic number.

It is an amenable number.

80656673 is a deficient number, since it is larger than the sum of its proper divisors (65827).

80656673 is a wasteful number, since it uses less digits than its factorization.

80656673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65826.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 80656673 is about 8980.9060233364. The cubic root of 80656673 is about 432.0626927333.

The spelling of 80656673 in words is "eighty million, six hundred fifty-six thousand, six hundred seventy-three".