66113520 has 160 divisors (see below), whose sum is σ = 227128320. Its totient is φ = 15774720.

The previous prime is 66113503. The next prime is 66113539. The reversal of 66113520 is 2531166.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208402 + ... + 208718.

It is an arithmetic number, because the mean of its divisors is an integer number (1419552).

Almost surely, 2^66113520 is an apocalyptic number.

66113520 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 66113520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113564160).

66113520 is an abundant number, since it is smaller than the sum of its proper divisors (161014800).

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

66113520 is a wasteful number, since it uses less digits than its factorization.

66113520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 66113520 is about 8131.0220759754. The cubic root of 66113520 is about 404.3555671101.

Adding to 66113520 its reverse (2531166), we get a palindrome (68644686).

The spelling of 66113520 in words is "sixty-six million, one hundred thirteen thousand, five hundred twenty".