66611622 has 64 divisors (see below), whose sum is σ = 171491328. Its totient is φ = 16740000.

The previous prime is 66611617. The next prime is 66611639. The reversal of 66611622 is 22611666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66611622.

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, 11997 + ... + 16647.

It is an arithmetic number, because the mean of its divisors is an integer number (2679552).

Almost surely, 2^66611622 is an apocalyptic number.

66611622 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66611622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85745664).

66611622 is an abundant number, since it is smaller than the sum of its proper divisors (104879706).

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

66611622 is a wasteful number, since it uses less digits than its factorization.

66611622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4705.

The product of its digits is 5184, while the sum is 30.

The square root of 66611622 is about 8161.5943295413. The cubic root of 66611622 is about 405.3685047161.

The spelling of 66611622 in words is "sixty-six million, six hundred eleven thousand, six hundred twenty-two".