66656583 has 12 divisors (see below), whose sum is σ = 110036368. Its totient is φ = 38089440.

The previous prime is 66656581. The next prime is 66656593. The reversal of 66656583 is 38565666.

It is not a de Polignac number, because 66656583 - 2¹ = 66656581 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 (66656581) 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, 528958 + ... + 529083.

Almost surely, 2^66656583 is an apocalyptic number.

66656583 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

66656583 is a deficient number, since it is larger than the sum of its proper divisors (43379785).

66656583 is a wasteful number, since it uses less digits than its factorization.

66656583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058054 (or 1058051 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 66656583 is about 8164.3482899739. The cubic root of 66656583 is about 405.4596883749.

The spelling of 66656583 in words is "sixty-six million, six hundred fifty-six thousand, five hundred eighty-three".