66351612 has 48 divisors (see below), whose sum is σ = 167946912. Its totient is φ = 20305920.

The previous prime is 66351569. The next prime is 66351683. The reversal of 66351612 is 21615366.

It is a self number, because there is not a number n which added to its sum of digits gives 66351612.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4398 + ... + 12330.

It is an arithmetic number, because the mean of its divisors is an integer number (3498894).

Almost surely, 2^66351612 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 66351612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83973456).

66351612 is an abundant number, since it is smaller than the sum of its proper divisors (101595300).

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

66351612 is a wasteful number, since it uses less digits than its factorization.

66351612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998 (or 7996 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 66351612 is about 8145.6498819922. The cubic root of 66351612 is about 404.8403821541.

Adding to 66351612 its reverse (21615366), we get a palindrome (87966978).

The spelling of 66351612 in words is "sixty-six million, three hundred fifty-one thousand, six hundred twelve".