666551203 has 4 divisors (see below), whose sum is σ = 674988640. Its totient is φ = 658113768.

The previous prime is 666551183. The next prime is 666551219. The reversal of 666551203 is 302155666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 302155666 = 2 ⋅151077833.

It is a cyclic number.

It is not a de Polignac number, because 666551203 - 2⁹ = 666550691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666551233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4218600 + ... + 4218757.

It is an arithmetic number, because the mean of its divisors is an integer number (168747160).

Almost surely, 2^666551203 is an apocalyptic number.

666551203 is a deficient number, since it is larger than the sum of its proper divisors (8437437).

666551203 is an equidigital number, since it uses as much as digits as its factorization.

666551203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8437436.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 666551203 is about 25817.6529336034. The cubic root of 666551203 is about 873.5300284226.

The spelling of 666551203 in words is "six hundred sixty-six million, five hundred fifty-one thousand, two hundred three".