86656509 has 12 divisors (see below), whose sum is σ = 125828352. Its totient is φ = 57467400.

The previous prime is 86656499. The next prime is 86656513. The reversal of 86656509 is 90565668.

86656509 is a `hidden beast` number, since 86 + 6 + 565 + 0 + 9 = 666.

It is not a de Polignac number, because 86656509 - 2¹⁷ = 86525437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86656589) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23487 + ... + 26924.

It is an arithmetic number, because the mean of its divisors is an integer number (10485696).

Almost surely, 2^86656509 is an apocalyptic number.

It is an amenable number.

86656509 is a deficient number, since it is larger than the sum of its proper divisors (39171843).

86656509 is a wasteful number, since it uses less digits than its factorization.

86656509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50608 (or 50605 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 86656509 is about 9308.9477923125. The cubic root of 86656509 is about 442.5208416881.

It can be divided in two parts, 866 and 56509, that added together give a palindrome (57375).

The spelling of 86656509 in words is "eighty-six million, six hundred fifty-six thousand, five hundred nine".