66568424 has 48 divisors (see below), whose sum is σ = 137853900. Its totient is φ = 30111744.

The previous prime is 66568421. The next prime is 66568433. The reversal of 66568424 is 42486566.

66568424 = T₄₉₁ + T₄₉₂ + ... + T₈₀₂.

It can be written as a sum of positive squares in 6 ways, for example, as 2280100 + 64288324 = 1510^2 + 8018^2 .

It is not an unprimeable number, because it can be changed into a prime (66568421) 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, 71192 + ... + 72120.

Almost surely, 2^66568424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66568424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68926950).

66568424 is an abundant number, since it is smaller than the sum of its proper divisors (71285476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66568424 is a wasteful number, since it uses less digits than its factorization.

66568424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 997 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The square root of 66568424 is about 8158.9474811400. The cubic root of 66568424 is about 405.2808578718.

It can be divided in two parts, 6656 and 8424, that multiplied together give a square (56070144 = 7488²).

The spelling of 66568424 in words is "sixty-six million, five hundred sixty-eight thousand, four hundred twenty-four".