66503021345 has 4 divisors (see below), whose sum is σ = 79803625620. Its totient is φ = 53202417072.

The previous prime is 66503021339. The next prime is 66503021359. The reversal of 66503021345 is 54312030566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11473837456 + 55029183889 = 107116^2 + 234583^2 .

It is a cyclic number.

It is not a de Polignac number, because 66503021345 - 2⁴ = 66503021329 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6650302130 + ... + 6650302139.

It is an arithmetic number, because the mean of its divisors is an integer number (19950906405).

Almost surely, 2^66503021345 is an apocalyptic number.

It is an amenable number.

66503021345 is a deficient number, since it is larger than the sum of its proper divisors (13300604275).

66503021345 is a wasteful number, since it uses less digits than its factorization.

66503021345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13300604274.

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 66503021345 in words is "sixty-six billion, five hundred three million, twenty-one thousand, three hundred forty-five".