66415103 has 4 divisors (see below), whose sum is σ = 66443328. Its totient is φ = 66386880.

The previous prime is 66415079. The next prime is 66415147. The reversal of 66415103 is 30151466.

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 66415103 - 2⁸ = 66414847 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 (66415163) 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, 10226 + ... + 15407.

It is an arithmetic number, because the mean of its divisors is an integer number (16610832).

Almost surely, 2^66415103 is an apocalyptic number.

66415103 is a deficient number, since it is larger than the sum of its proper divisors (28225).

66415103 is a wasteful number, since it uses less digits than its factorization.

66415103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28224.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 66415103 is about 8149.5461836841. The cubic root of 66415103 is about 404.9694698319.

Adding to 66415103 its reverse (30151466), we get a palindrome (96566569).

The spelling of 66415103 in words is "sixty-six million, four hundred fifteen thousand, one hundred three".