16436721996680 has 128 divisors (see below), whose sum is σ = 39162163582080. Its totient is φ = 6200527656960.

The previous prime is 16436721996671. The next prime is 16436721996689. The reversal of 16436721996680 is 8669912763461.

It is an interprime number because it is at equal distance from previous prime (16436721996671) and next prime (16436721996689).

It is a super-2 number, since 2×16436721996680² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16436721996680.

It is not an unprimeable number, because it can be changed into a prime (16436721996689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7351052 + ... + 9322628.

It is an arithmetic number, because the mean of its divisors is an integer number (305954402985).

Almost surely, 2^{16436721996680} is an apocalyptic number.

16436721996680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16436721996680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19581081791040).

16436721996680 is an abundant number, since it is smaller than the sum of its proper divisors (22725441585400).

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

16436721996680 is a wasteful number, since it uses less digits than its factorization.

16436721996680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971799 (or 1971795 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 68.

The spelling of 16436721996680 in words is "sixteen trillion, four hundred thirty-six billion, seven hundred twenty-one million, nine hundred ninety-six thousand, six hundred eighty".