66513008 has 30 divisors (see below), whose sum is σ = 133492944. Its totient is φ = 32103232.

The previous prime is 66512989. The next prime is 66513017. The reversal of 66513008 is 80031566.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10985 + ... + 15927.

Almost surely, 2^66513008 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 66513008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66746472).

66513008 is an abundant number, since it is smaller than the sum of its proper divisors (66979936).

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

66513008 is a wasteful number, since it uses less digits than its factorization.

66513008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5009 (or 4974 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66513008 is about 8155.5507478036. The cubic root of 66513008 is about 405.1683657036.

The spelling of 66513008 in words is "sixty-six million, five hundred thirteen thousand, eight".