66121203 has 8 divisors (see below), whose sum is σ = 89224128. Its totient is φ = 43549544.

The previous prime is 66121201. The next prime is 66121243. The reversal of 66121203 is 30212166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66121203 - 2¹ = 66121201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66121203.

It is not an unprimeable number, because it can be changed into a prime (66121201) 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, 132525 + ... + 133022.

It is an arithmetic number, because the mean of its divisors is an integer number (11153016).

Almost surely, 2^66121203 is an apocalyptic number.

66121203 is a deficient number, since it is larger than the sum of its proper divisors (23102925).

66121203 is a wasteful number, since it uses less digits than its factorization.

66121203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265633.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 66121203 is about 8131.4945120808. The cubic root of 66121203 is about 404.3712297839.

Adding to 66121203 its reverse (30212166), we get a palindrome (96333369).

The spelling of 66121203 in words is "sixty-six million, one hundred twenty-one thousand, two hundred three".