80856539666780 has 24 divisors (see below), whose sum is σ = 173940165821520. Its totient is φ = 31553771576960.

The previous prime is 80856539666761. The next prime is 80856539666783. The reversal of 80856539666780 is 8766693565808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80856539666783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49302767270 + ... + 49302768909.

It is an arithmetic number, because the mean of its divisors is an integer number (7247506909230).

Almost surely, 2^{80856539666780} is an apocalyptic number.

It is an amenable number.

80856539666780 is an abundant number, since it is smaller than the sum of its proper divisors (93083626154740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80856539666780 is a wasteful number, since it uses less digits than its factorization.

80856539666780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98605536229 (or 98605536227 counting only the distinct ones).

The product of its (nonzero) digits is 3135283200, while the sum is 77.

The spelling of 80856539666780 in words is "eighty trillion, eight hundred fifty-six billion, five hundred thirty-nine million, six hundred sixty-six thousand, seven hundred eighty".