66620003 has 2 divisors, whose sum is σ = 66620004. Its totient is φ = 66620002.

The previous prime is 66619999. The next prime is 66620053. The reversal of 66620003 is 30002666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66620003 - 2² = 66619999 is a prime.

It is not a weakly prime, because it can be changed into another prime (66620053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33310001 + 33310002.

It is an arithmetic number, because the mean of its divisors is an integer number (33310002).

Almost surely, 2^66620003 is an apocalyptic number.

66620003 is a deficient number, since it is larger than the sum of its proper divisors (1).

66620003 is an equidigital number, since it uses as much as digits as its factorization.

66620003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 66620003 is about 8162.1077547408. The cubic root of 66620003 is about 405.3855050075.

Adding to 66620003 its reverse (30002666), we get a palindrome (96622669).

The spelling of 66620003 in words is "sixty-six million, six hundred twenty thousand, three".