80566362691 has 4 divisors (see below), whose sum is σ = 80581763752. Its totient is φ = 80550961632.

The previous prime is 80566362677. The next prime is 80566362761. The reversal of 80566362691 is 19626366508.

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 80566362691 - 2³¹ = 78418879043 is a prime.

It is a super-2 number, since 2×80566362691² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80566362641) 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, 7692681 + ... + 7703146.

It is an arithmetic number, because the mean of its divisors is an integer number (20145440938).

Almost surely, 2^80566362691 is an apocalyptic number.

80566362691 is a deficient number, since it is larger than the sum of its proper divisors (15401061).

80566362691 is a wasteful number, since it uses less digits than its factorization.

80566362691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15401060.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 80566362691 in words is "eighty billion, five hundred sixty-six million, three hundred sixty-two thousand, six hundred ninety-one".