66642003 has 12 divisors (see below), whose sum is σ = 96445648. Its totient is φ = 44342640.

The previous prime is 66641999. The next prime is 66642011. The reversal of 66642003 is 30024666.

It is not a de Polignac number, because 66642003 - 2² = 66641999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66642053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1975 + ... + 11712.

Almost surely, 2^66642003 is an apocalyptic number.

66642003 is a deficient number, since it is larger than the sum of its proper divisors (29803645).

66642003 is a wasteful number, since it uses less digits than its factorization.

66642003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14234 (or 14231 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 66642003 is about 8163.4553345994. The cubic root of 66642003 is about 405.4301237364.

Adding to 66642003 its reverse (30024666), we get a palindrome (96666669).

The spelling of 66642003 in words is "sixty-six million, six hundred forty-two thousand, three".