66111606 has 64 divisors (see below), whose sum is σ = 169724160. Its totient is φ = 18852480.

The previous prime is 66111599. The next prime is 66111631. The reversal of 66111606 is 60611166.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66111606.

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, 6825 + ... + 13371.

It is an arithmetic number, because the mean of its divisors is an integer number (2651940).

Almost surely, 2^66111606 is an apocalyptic number.

66111606 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66111606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84862080).

66111606 is an abundant number, since it is smaller than the sum of its proper divisors (103612554).

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

66111606 is a wasteful number, since it uses less digits than its factorization.

66111606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6586 (or 6580 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 66111606 is about 8130.9043777430. The cubic root of 66111606 is about 404.3516650135.

It can be divided in two parts, 6611160 and 6, that added together give a palindrome (6611166).

The spelling of 66111606 in words is "sixty-six million, one hundred eleven thousand, six hundred six".