66103620 has 96 divisors (see below), whose sum is σ = 206309376. Its totient is φ = 15676800.

The previous prime is 66103619. The next prime is 66103643. The reversal of 66103620 is 2630166.

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, 29955 + ... + 32085.

It is an arithmetic number, because the mean of its divisors is an integer number (2149056).

Almost surely, 2^66103620 is an apocalyptic number.

66103620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66103620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103154688).

66103620 is an abundant number, since it is smaller than the sum of its proper divisors (140205756).

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

66103620 is a wasteful number, since it uses less digits than its factorization.

66103620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201 (or 2199 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 66103620 is about 8130.4132736288. The cubic root of 66103620 is about 404.3353830392.

Adding to 66103620 its reverse (2630166), we get a palindrome (68733786).

The spelling of 66103620 in words is "sixty-six million, one hundred three thousand, six hundred twenty".