66059840 has 168 divisors, whose sum is σ = 200143872. Its totient is φ = 20536320.

The previous prime is 66059831. The next prime is 66059843. The reversal of 66059840 is 4895066.

It is a junction number, because it is equal to n+sod(n) for n = 66059794 and 66059803.

It is not an unprimeable number, because it can be changed into a prime (66059843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172289 + ... + 172671.

Almost surely, 2^66059840 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 66059840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100071936).

66059840 is an abundant number, since it is smaller than the sum of its proper divisors (134084032).

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

66059840 is a wasteful number, since it uses less digits than its factorization.

66059840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66059840 is about 8127.7204676342. The cubic root of 66059840 is about 404.2461004228.

The spelling of 66059840 in words is "sixty-six million, fifty-nine thousand, eight hundred forty".