66518480 has 120 divisors (see below), whose sum is σ = 183202560. Its totient is φ = 22391040.

The previous prime is 66518453. The next prime is 66518497. The reversal of 66518480 is 8481566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278201 + ... + 278439.

It is an arithmetic number, because the mean of its divisors is an integer number (1526688).

Almost surely, 2^66518480 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 66518480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91601280).

66518480 is an abundant number, since it is smaller than the sum of its proper divisors (116684080).

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

66518480 is a wasteful number, since it uses less digits than its factorization.

66518480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 66518480 is about 8155.8862179410. The cubic root of 66518480 is about 405.1794764150.

The spelling of 66518480 in words is "sixty-six million, five hundred eighteen thousand, four hundred eighty".