66650480 has 80 divisors (see below), whose sum is σ = 175717920. Its totient is φ = 23307264.

The previous prime is 66650477. The next prime is 66650501. The reversal of 66650480 is 8405666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 66650480.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18074 + ... + 21446.

It is an arithmetic number, because the mean of its divisors is an integer number (2196474).

Almost surely, 2^66650480 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 66650480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87858960).

66650480 is an abundant number, since it is smaller than the sum of its proper divisors (109067440).

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

66650480 is a wasteful number, since it uses less digits than its factorization.

66650480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3412 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 66650480 is about 8163.9745222532. The cubic root of 66650480 is about 405.4473135231.

The spelling of 66650480 in words is "sixty-six million, six hundred fifty thousand, four hundred eighty".