66215111424 has 576 divisors, whose sum is σ = 232266424320. Its totient is φ = 16236380160.

The previous prime is 66215111423. The next prime is 66215111453. The reversal of 66215111424 is 42411151266.

66215111424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (66215111423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121051119 + ... + 121051665.

It is an arithmetic number, because the mean of its divisors is an integer number (403240320).

Almost surely, 2^66215111424 is an apocalyptic number.

66215111424 is a gapful number since it is divisible by the number (64) 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 66215111424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116133212160).

66215111424 is an abundant number, since it is smaller than the sum of its proper divisors (166051312896).

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

66215111424 is a wasteful number, since it uses less digits than its factorization.

66215111424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 682 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The spelling of 66215111424 in words is "sixty-six billion, two hundred fifteen million, one hundred eleven thousand, four hundred twenty-four".