80005805861 has 4 divisors (see below), whose sum is σ = 80006932992. Its totient is φ = 80004678732.

The previous prime is 80005805837. The next prime is 80005805863. The reversal of 80005805861 is 16850850008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80005805861 - 2¹⁴ = 80005789477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80005805863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449381 + ... + 601626.

It is an arithmetic number, because the mean of its divisors is an integer number (20001733248).

Almost surely, 2^80005805861 is an apocalyptic number.

It is an amenable number.

80005805861 is a deficient number, since it is larger than the sum of its proper divisors (1127131).

80005805861 is a wasteful number, since it uses less digits than its factorization.

80005805861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127130.

The product of its (nonzero) digits is 76800, while the sum is 41.

The spelling of 80005805861 in words is "eighty billion, five million, eight hundred five thousand, eight hundred sixty-one".