660121003 has 2 divisors, whose sum is σ = 660121004. Its totient is φ = 660121002.

The previous prime is 660120991. The next prime is 660121013. The reversal of 660121003 is 300121066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660121003 - 2⁹ = 660120491 is a prime.

It is not a weakly prime, because it can be changed into another prime (660121013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330060501 + 330060502.

It is an arithmetic number, because the mean of its divisors is an integer number (330060502).

Almost surely, 2^660121003 is an apocalyptic number.

660121003 is a deficient number, since it is larger than the sum of its proper divisors (1).

660121003 is an equidigital number, since it uses as much as digits as its factorization.

660121003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 660121003 is about 25692.8200670927. The cubic root of 660121003 is about 870.7119741100.

Adding to 660121003 its reverse (300121066), we get a palindrome (960242069).

The spelling of 660121003 in words is "six hundred sixty million, one hundred twenty-one thousand, three".