66503275 has 6 divisors (see below), whose sum is σ = 82464092. Its totient is φ = 53202600.

The previous prime is 66503267. The next prime is 66503279. The reversal of 66503275 is 57230566.

It is not a de Polignac number, because 66503275 - 2³ = 66503267 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66503275.

It is not an unprimeable number, because it can be changed into a prime (66503279) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1330041 + ... + 1330090.

Almost surely, 2^66503275 is an apocalyptic number.

66503275 is a deficient number, since it is larger than the sum of its proper divisors (15960817).

66503275 is a wasteful number, since it uses less digits than its factorization.

66503275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660141 (or 2660136 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 66503275 is about 8154.9540158115. The cubic root of 66503275 is about 405.1486016695.

The spelling of 66503275 in words is "sixty-six million, five hundred three thousand, two hundred seventy-five".