66503533907 has 2 divisors, whose sum is σ = 66503533908. Its totient is φ = 66503533906.

The previous prime is 66503533883. The next prime is 66503533909. The reversal of 66503533907 is 70933530566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66503533907 - 2⁸ = 66503533651 is a prime.

Together with 66503533909, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66503533909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33251766953 + 33251766954.

It is an arithmetic number, because the mean of its divisors is an integer number (33251766954).

Almost surely, 2^66503533907 is an apocalyptic number.

66503533907 is a deficient number, since it is larger than the sum of its proper divisors (1).

66503533907 is an equidigital number, since it uses as much as digits as its factorization.

66503533907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1530900, while the sum is 47.

The spelling of 66503533907 in words is "sixty-six billion, five hundred three million, five hundred thirty-three thousand, nine hundred seven".