16642489980 has 48 divisors (see below), whose sum is σ = 46633142304. Its totient is φ = 4434743040.

The previous prime is 16642489967. The next prime is 16642489987. The reversal of 16642489980 is 8998424661.

It is a self number, because there is not a number n which added to its sum of digits gives 16642489980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16642489987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18631 + ... + 183390.

It is an arithmetic number, because the mean of its divisors is an integer number (971523798).

Almost surely, 2^16642489980 is an apocalyptic number.

16642489980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16642489980 is an abundant number, since it is smaller than the sum of its proper divisors (29990652324).

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

16642489980 is a wasteful number, since it uses less digits than its factorization.

16642489980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203406 (or 203404 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 57.

The spelling of 16642489980 in words is "sixteen billion, six hundred forty-two million, four hundred eighty-nine thousand, nine hundred eighty".