66802640424 has 48 divisors (see below), whose sum is σ = 180841478400. Its totient is φ = 20554657344.

The previous prime is 66802640407. The next prime is 66802640431. The reversal of 66802640424 is 42404620866.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8230984 + ... + 8239095.

It is an arithmetic number, because the mean of its divisors is an integer number (3767530800).

Almost surely, 2^66802640424 is an apocalyptic number.

It is an amenable number.

66802640424 is an abundant number, since it is smaller than the sum of its proper divisors (114038837976).

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

66802640424 is a wasteful number, since it uses less digits than its factorization.

66802640424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16470114 (or 16470097 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 42.

The spelling of 66802640424 in words is "sixty-six billion, eight hundred two million, six hundred forty thousand, four hundred twenty-four".