66444103 has 4 divisors (see below), whose sum is σ = 72484488. Its totient is φ = 60403720.

The previous prime is 66444097. The next prime is 66444173. The reversal of 66444103 is 30144466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66444103 - 2¹³ = 66435911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66444173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3020176 + ... + 3020197.

It is an arithmetic number, because the mean of its divisors is an integer number (18121122).

Almost surely, 2^66444103 is an apocalyptic number.

66444103 is a deficient number, since it is larger than the sum of its proper divisors (6040385).

66444103 is a wasteful number, since it uses less digits than its factorization.

66444103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040384.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66444103 is about 8151.3252296789. The cubic root of 66444103 is about 405.0284042467.

Adding to 66444103 its reverse (30144466), we get a palindrome (96588569).

The spelling of 66444103 in words is "sixty-six million, four hundred forty-four thousand, one hundred three".