66821233488 has 40 divisors (see below), whose sum is σ = 172669433568. Its totient is φ = 22267562112.

The previous prime is 66821233459. The next prime is 66821233511. The reversal of 66821233488 is 88433212866.

It is a super-2 number, since 2×66821233488² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 66821233488.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16806 + ... + 365957.

Almost surely, 2^66821233488 is an apocalyptic number.

It is an amenable number.

66821233488 is an abundant number, since it is smaller than the sum of its proper divisors (105848200080).

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

66821233488 is a wasteful number, since it uses less digits than its factorization.

66821233488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386411 (or 386405 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 51.

The spelling of 66821233488 in words is "sixty-six billion, eight hundred twenty-one million, two hundred thirty-three thousand, four hundred eighty-eight".