80185642664569 has 4 divisors (see below), whose sum is σ = 86353769023396. Its totient is φ = 74017516305744.

The previous prime is 80185642664551. The next prime is 80185642664609. The reversal of 80185642664569 is 96546624658108.

It is a happy number.

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 30027802536169 + 50157840128400 = 5479763^2 + 7082220^2 .

It is a cyclic number.

It is not a de Polignac number, because 80185642664569 - 2¹⁷ = 80185642533497 is a prime.

It is a super-2 number, since 2×80185642664569² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80185642664498 and 80185642664507.

It is not an unprimeable number, because it can be changed into a prime (80185642604569) 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, 3084063179394 + ... + 3084063179419.

It is an arithmetic number, because the mean of its divisors is an integer number (21588442255849).

Almost surely, 2^{80185642664569} is an apocalyptic number.

It is an amenable number.

80185642664569 is a deficient number, since it is larger than the sum of its proper divisors (6168126358827).

80185642664569 is a wasteful number, since it uses less digits than its factorization.

80185642664569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6168126358826.

The product of its (nonzero) digits is 597196800, while the sum is 70.

The spelling of 80185642664569 in words is "eighty trillion, one hundred eighty-five billion, six hundred forty-two million, six hundred sixty-four thousand, five hundred sixty-nine".