80785511 has 4 divisors (see below), whose sum is σ = 85037400. Its totient is φ = 76533624.

The previous prime is 80785489. The next prime is 80785517. The reversal of 80785511 is 11558708.

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 80785511 - 2¹⁸ = 80523367 is a prime.

It is a super-2 number, since 2×80785511² = 13052597575062242, 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 (80785517) 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, 2125916 + ... + 2125953.

It is an arithmetic number, because the mean of its divisors is an integer number (21259350).

Almost surely, 2^80785511 is an apocalyptic number.

80785511 is a deficient number, since it is larger than the sum of its proper divisors (4251889).

80785511 is a wasteful number, since it uses less digits than its factorization.

80785511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251888.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 80785511 is about 8988.0760455172. The cubic root of 80785511 is about 432.2926240283.

The spelling of 80785511 in words is "eighty million, seven hundred eighty-five thousand, five hundred eleven".