664121143 has 4 divisors (see below), whose sum is σ = 758995600. Its totient is φ = 569246688.

The previous prime is 664121119. The next prime is 664121173. The reversal of 664121143 is 341121466.

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 664121143 - 2¹³ = 664112951 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 (664121173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47437218 + ... + 47437231.

It is an arithmetic number, because the mean of its divisors is an integer number (189748900).

Almost surely, 2^664121143 is an apocalyptic number.

664121143 is a deficient number, since it is larger than the sum of its proper divisors (94874457).

664121143 is an equidigital number, since it uses as much as digits as its factorization.

664121143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94874456.

The product of its digits is 3456, while the sum is 28.

The square root of 664121143 is about 25770.5479763237. The cubic root of 664121143 is about 872.4671867201.

The spelling of 664121143 in words is "six hundred sixty-four million, one hundred twenty-one thousand, one hundred forty-three".