66520404936 has 48 divisors (see below), whose sum is σ = 189641509200. Its totient is φ = 21006443232.

The previous prime is 66520404931. The next prime is 66520404953. The reversal of 66520404936 is 63940402566.

It is a junction number, because it is equal to n+sod(n) for n = 66520404891 and 66520404900.

It is not an unprimeable number, because it can be changed into a prime (66520404931) 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, 24311646 + ... + 24314381.

It is an arithmetic number, because the mean of its divisors is an integer number (3950864775).

Almost surely, 2^66520404936 is an apocalyptic number.

It is an amenable number.

66520404936 is an abundant number, since it is smaller than the sum of its proper divisors (123121104264).

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

66520404936 is a wasteful number, since it uses less digits than its factorization.

66520404936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48626058 (or 48626051 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 66520404936 in words is "sixty-six billion, five hundred twenty million, four hundred four thousand, nine hundred thirty-six".