80657123816645 has 8 divisors (see below), whose sum is σ = 96788659015320. Its totient is φ = 64525625429760.

The previous prime is 80657123816639. The next prime is 80657123816669. The reversal of 80657123816645 is 54661832175608.

It can be written as a sum of positive squares in 4 ways, for example, as 1917092237281 + 78740031579364 = 1384591^2 + 8873558^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 80657123816645 - 2²⁸ = 80656855381189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4128200 + ... + 13355009.

It is an arithmetic number, because the mean of its divisors is an integer number (12098582376915).

Almost surely, 2^{80657123816645} is an apocalyptic number.

It is an amenable number.

80657123816645 is a deficient number, since it is larger than the sum of its proper divisors (16131535198675).

80657123816645 is a wasteful number, since it uses less digits than its factorization.

80657123816645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18405895.

The product of its (nonzero) digits is 58060800, while the sum is 62.

The spelling of 80657123816645 in words is "eighty trillion, six hundred fifty-seven billion, one hundred twenty-three million, eight hundred sixteen thousand, six hundred forty-five".