81333346680 has 48 divisors (see below), whose sum is σ = 264333377880. Its totient is φ = 21688892352.

The previous prime is 81333346673. The next prime is 81333346709. The reversal of 81333346680 is 8664333318.

81333346680 is a `hidden beast` number, since 81 + 3 + 3 + 33 + 466 + 80 = 666.

It is a super-2 number, since 2×81333346680² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 112962622 + ... + 112963341.

Almost surely, 2^81333346680 is an apocalyptic number.

It is an amenable number.

81333346680 is an abundant number, since it is smaller than the sum of its proper divisors (183000031200).

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

81333346680 is a wasteful number, since it uses less digits than its factorization.

81333346680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225925980 (or 225925973 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

Adding to 81333346680 its reverse (8664333318), we get a palindrome (89997679998).

The spelling of 81333346680 in words is "eighty-one billion, three hundred thirty-three million, three hundred forty-six thousand, six hundred eighty".