80816123112761 has 4 divisors (see below), whose sum is σ = 80863411659300. Its totient is φ = 80768834566224.

The previous prime is 80816123112757. The next prime is 80816123112797. The reversal of 80816123112761 is 16721132161808.

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 6419356986025 + 74396766126736 = 2533645^2 + 8625356^2 .

It is a cyclic number.

It is not a de Polignac number, because 80816123112761 - 2² = 80816123112757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80816123112961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23644270706 + ... + 23644274123.

It is an arithmetic number, because the mean of its divisors is an integer number (20215852914825).

Almost surely, 2^{80816123112761} is an apocalyptic number.

It is an amenable number.

80816123112761 is a deficient number, since it is larger than the sum of its proper divisors (47288546539).

80816123112761 is a wasteful number, since it uses less digits than its factorization.

80816123112761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47288546538.

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 80816123112761 in words is "eighty trillion, eight hundred sixteen billion, one hundred twenty-three million, one hundred twelve thousand, seven hundred sixty-one".