66019680 has 216 divisors, whose sum is σ = 239645952. Its totient is φ = 16547328.

The previous prime is 66019673. The next prime is 66019697. The reversal of 66019680 is 8691066.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 519777 + ... + 519903.

It is an arithmetic number, because the mean of its divisors is an integer number (1109472).

Almost surely, 2^66019680 is an apocalyptic number.

66019680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66019680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119822976).

66019680 is an abundant number, since it is smaller than the sum of its proper divisors (173626272).

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

66019680 is a wasteful number, since it uses less digits than its factorization.

66019680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 66019680 is about 8125.2495346297. The cubic root of 66019680 is about 404.1641655470.

The spelling of 66019680 in words is "sixty-six million, nineteen thousand, six hundred eighty".