66006420503 has 2 divisors, whose sum is σ = 66006420504. Its totient is φ = 66006420502.

The previous prime is 66006420463. The next prime is 66006420517. The reversal of 66006420503 is 30502460066.

66006420503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66006420503 - 2³² = 61711453207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66006420503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66006420553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33003210251 + 33003210252.

It is an arithmetic number, because the mean of its divisors is an integer number (33003210252).

Almost surely, 2^66006420503 is an apocalyptic number.

66006420503 is a deficient number, since it is larger than the sum of its proper divisors (1).

66006420503 is an equidigital number, since it uses as much as digits as its factorization.

66006420503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 66006420503 its reverse (30502460066), we get a palindrome (96508880569).

The spelling of 66006420503 in words is "sixty-six billion, six million, four hundred twenty thousand, five hundred three".