66511864824 has 16 divisors (see below), whose sum is σ = 166279662120. Its totient is φ = 22170621600.

The previous prime is 66511864823. The next prime is 66511864831. The reversal of 66511864824 is 42846811566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66511864823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1385663827 + ... + 1385663874.

Almost surely, 2^66511864824 is an apocalyptic number.

It is an amenable number.

66511864824 is an abundant number, since it is smaller than the sum of its proper divisors (99767797296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66511864824 is a wasteful number, since it uses less digits than its factorization.

66511864824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771327710 (or 2771327706 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 51.

The spelling of 66511864824 in words is "sixty-six billion, five hundred eleven million, eight hundred sixty-four thousand, eight hundred twenty-four".