66693810424 has 48 divisors (see below), whose sum is σ = 131382846000. Its totient is φ = 31736352384.

The previous prime is 66693810377. The next prime is 66693810427. The reversal of 66693810424 is 42401839666.

66693810424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66693810427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 802572 + ... + 881764.

It is an arithmetic number, because the mean of its divisors is an integer number (2737142625).

Almost surely, 2^66693810424 is an apocalyptic number.

It is an amenable number.

66693810424 is a deficient number, since it is larger than the sum of its proper divisors (64689035576).

66693810424 is a wasteful number, since it uses less digits than its factorization.

66693810424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79444 (or 79417 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 66693810424 in words is "sixty-six billion, six hundred ninety-three million, eight hundred ten thousand, four hundred twenty-four".