66311622 has 120 divisors (see below), whose sum is σ = 171608976. Its totient is φ = 18988992.

The previous prime is 66311621. The next prime is 66311627. The reversal of 66311622 is 22611366.

66311622 is a `hidden beast` number, since 6 + 6 + 31 + 1 + 622 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66311621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1792188 + ... + 1792224.

Almost surely, 2^66311622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66311622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85804488).

66311622 is an abundant number, since it is smaller than the sum of its proper divisors (105297354).

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

66311622 is a wasteful number, since it uses less digits than its factorization.

66311622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 78 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 66311622 is about 8143.1948275846. The cubic root of 66311622 is about 404.7590336133.

Adding to 66311622 its reverse (22611366), we get a palindrome (88922988).

The spelling of 66311622 in words is "sixty-six million, three hundred eleven thousand, six hundred twenty-two".