80885780691 has 4 divisors (see below), whose sum is σ = 107847707592. Its totient is φ = 53923853792.

The previous prime is 80885780671. The next prime is 80885780693. The reversal of 80885780691 is 19608758808.

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

It is a cyclic number.

It is not a de Polignac number, because 80885780691 - 2⁵ = 80885780659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80885780693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13480963446 + ... + 13480963451.

It is an arithmetic number, because the mean of its divisors is an integer number (26961926898).

Almost surely, 2^80885780691 is an apocalyptic number.

80885780691 is a deficient number, since it is larger than the sum of its proper divisors (26961926901).

80885780691 is a wasteful number, since it uses less digits than its factorization.

80885780691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26961926900.

The product of its (nonzero) digits is 7741440, while the sum is 60.

The spelling of 80885780691 in words is "eighty billion, eight hundred eighty-five million, seven hundred eighty thousand, six hundred ninety-one".