66598416 has 80 divisors (see below), whose sum is σ = 197368320. Its totient is φ = 21479040.

The previous prime is 66598387. The next prime is 66598417. The reversal of 66598416 is 61489566.

It is not an unprimeable number, because it can be changed into a prime (66598417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10906 + ... + 15878.

It is an arithmetic number, because the mean of its divisors is an integer number (2467104).

Almost surely, 2^66598416 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 66598416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98684160).

66598416 is an abundant number, since it is smaller than the sum of its proper divisors (130769904).

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

66598416 is a wasteful number, since it uses less digits than its factorization.

66598416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021 (or 5009 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 66598416 is about 8160.7852563341. The cubic root of 66598416 is about 405.3417143446.

The spelling of 66598416 in words is "sixty-six million, five hundred ninety-eight thousand, four hundred sixteen".