66122420 has 96 divisors (see below), whose sum is σ = 174763008. Its totient is φ = 20454912.

The previous prime is 66122387. The next prime is 66122431. The reversal of 66122420 is 2422166.

66122420 = T₁₂₅ + T₁₂₆ + ... + T₇₃₅.

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, 85154 + ... + 85926.

It is an arithmetic number, because the mean of its divisors is an integer number (1820448).

Almost surely, 2^66122420 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 66122420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87381504).

66122420 is an abundant number, since it is smaller than the sum of its proper divisors (108640588).

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

66122420 is a wasteful number, since it uses less digits than its factorization.

66122420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 847 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 66122420 is about 8131.5693442287. The cubic root of 66122420 is about 404.3737106662.

Adding to 66122420 its reverse (2422166), we get a palindrome (68544586).

The spelling of 66122420 in words is "sixty-six million, one hundred twenty-two thousand, four hundred twenty".