66603441 has 16 divisors (see below), whose sum is σ = 91776384. Its totient is φ = 42931584.

The previous prime is 66603403. The next prime is 66603451. The reversal of 66603441 is 14430666.

It is not a de Polignac number, because 66603441 - 2²¹ = 64506289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66603399 and 66603408.

It is not an unprimeable number, because it can be changed into a prime (66603451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16741 + ... + 20333.

It is an arithmetic number, because the mean of its divisors is an integer number (5736024).

Almost surely, 2^66603441 is an apocalyptic number.

It is an amenable number.

66603441 is a deficient number, since it is larger than the sum of its proper divisors (25172943).

66603441 is a wasteful number, since it uses less digits than its factorization.

66603441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 66603441 is about 8161.0931253111. The cubic root of 66603441 is about 405.3519087357.

It can be divided in two parts, 6660 and 3441, that added together give a palindrome (10101).

The spelling of 66603441 in words is "sixty-six million, six hundred three thousand, four hundred forty-one".