66103321 has 8 divisors (see below), whose sum is σ = 67350600. Its totient is φ = 64861440.

The previous prime is 66103313. The next prime is 66103333. The reversal of 66103321 is 12330166.

It can be written as a sum of positive squares in 4 ways, for example, as 1123600 + 64979721 = 1060^2 + 8061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66103321 - 2³ = 66103313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66103292 and 66103301.

It is not an unprimeable number, because it can be changed into a prime (66103351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29985 + ... + 32113.

It is an arithmetic number, because the mean of its divisors is an integer number (8418825).

Almost surely, 2^66103321 is an apocalyptic number.

66103321 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66103321 is a deficient number, since it is larger than the sum of its proper divisors (1247279).

66103321 is a wasteful number, since it uses less digits than its factorization.

66103321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 66103321 is about 8130.3948858589. The cubic root of 66103321 is about 404.3347734081.

Adding to 66103321 its reverse (12330166), we get a palindrome (78433487).

It can be divided in two parts, 66 and 103321, that multiplied together give a palindrome (6819186).

The spelling of 66103321 in words is "sixty-six million, one hundred three thousand, three hundred twenty-one".