80205511 has 4 divisors (see below), whose sum is σ = 80247672. Its totient is φ = 80163352.

The previous prime is 80205509. The next prime is 80205551. The reversal of 80205511 is 11550208.

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 80205511 - 2¹ = 80205509 is a prime.

It is a super-2 number, since 2×80205511² = 12865847989542242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80205551) 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, 18085 + ... + 22078.

It is an arithmetic number, because the mean of its divisors is an integer number (20061918).

Almost surely, 2^80205511 is an apocalyptic number.

80205511 is a deficient number, since it is larger than the sum of its proper divisors (42161).

80205511 is a wasteful number, since it uses less digits than its factorization.

80205511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42160.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 80205511 is about 8955.7529555030. The cubic root of 80205511 is about 431.2555892015.

Adding to 80205511 its reverse (11550208), we get a palindrome (91755719).

It can be divided in two parts, 8020 and 5511, that added together give a palindrome (13531).

The spelling of 80205511 in words is "eighty million, two hundred five thousand, five hundred eleven".