66503112823 has 16 divisors (see below), whose sum is σ = 78642432000. Its totient is φ = 55024415712.

The previous prime is 66503112811. The next prime is 66503112859. The reversal of 66503112823 is 32821130566.

It is a de Polignac number, because none of the positive numbers 2^k-66503112823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66503112803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 906408 + ... + 977026.

It is an arithmetic number, because the mean of its divisors is an integer number (4915152000).

Almost surely, 2^66503112823 is an apocalyptic number.

66503112823 is a deficient number, since it is larger than the sum of its proper divisors (12139319177).

66503112823 is a wasteful number, since it uses less digits than its factorization.

66503112823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75294.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 66503112823 in words is "sixty-six billion, five hundred three million, one hundred twelve thousand, eight hundred twenty-three".