66521103 has 8 divisors (see below), whose sum is σ = 96758016. Its totient is φ = 40315800.

The previous prime is 66521101. The next prime is 66521113. The reversal of 66521103 is 30112566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66521103 - 2¹ = 66521101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66521101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1007863 + ... + 1007928.

It is an arithmetic number, because the mean of its divisors is an integer number (12094752).

Almost surely, 2^66521103 is an apocalyptic number.

66521103 is a deficient number, since it is larger than the sum of its proper divisors (30236913).

66521103 is a wasteful number, since it uses less digits than its factorization.

66521103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015805.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 66521103 is about 8156.0470204628. The cubic root of 66521103 is about 405.1848021119.

Adding to 66521103 its reverse (30112566), we get a palindrome (96633669).

The spelling of 66521103 in words is "sixty-six million, five hundred twenty-one thousand, one hundred three".