16040821684 has 6 divisors (see below), whose sum is σ = 28071437954. Its totient is φ = 8020410840.

The previous prime is 16040821681. The next prime is 16040821721. The reversal of 16040821684 is 48612804061.

It can be written as a sum of positive squares in only one way, i.e., 8634498084 + 7406323600 = 92922^2 + 86060^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16040821681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2005102707 + ... + 2005102714.

Almost surely, 2^16040821684 is an apocalyptic number.

It is an amenable number.

16040821684 is a deficient number, since it is larger than the sum of its proper divisors (12030616270).

16040821684 is a wasteful number, since it uses less digits than its factorization.

16040821684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010205425 (or 4010205423 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 16040821684 in words is "sixteen billion, forty million, eight hundred twenty-one thousand, six hundred eighty-four".