66420522 has 48 divisors (see below), whose sum is σ = 166345920. Its totient is φ = 18760896.

The previous prime is 66420503. The next prime is 66420539. The reversal of 66420522 is 22502466.

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, 8253 + ... + 14175.

It is an arithmetic number, because the mean of its divisors is an integer number (3465540).

Almost surely, 2^66420522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66420522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83172960).

66420522 is an abundant number, since it is smaller than the sum of its proper divisors (99925398).

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

66420522 is a wasteful number, since it uses less digits than its factorization.

66420522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6027 (or 6024 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 66420522 is about 8149.8786494033. The cubic root of 66420522 is about 404.9804837418.

Adding to 66420522 its reverse (22502466), we get a palindrome (88922988).

The spelling of 66420522 in words is "sixty-six million, four hundred twenty thousand, five hundred twenty-two".