16721245736 has 32 divisors (see below), whose sum is σ = 34170867360. Its totient is φ = 7624512192.

The previous prime is 16721245711. The next prime is 16721245787. The reversal of 16721245736 is 63754212761.

It is a happy 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, 959930 + ... + 977193.

It is an arithmetic number, because the mean of its divisors is an integer number (1067839605).

Almost surely, 2^16721245736 is an apocalyptic number.

It is an amenable number.

16721245736 is an abundant number, since it is smaller than the sum of its proper divisors (17449621624).

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

16721245736 is a wasteful number, since it uses less digits than its factorization.

16721245736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937225 (or 1937221 counting only the distinct ones).

The product of its digits is 423360, while the sum is 44.

The spelling of 16721245736 in words is "sixteen billion, seven hundred twenty-one million, two hundred forty-five thousand, seven hundred thirty-six".