16689057420 has 384 divisors, whose sum is σ = 58089830400. Its totient is φ = 3493675008.

The previous prime is 16689057391. The next prime is 16689057521. The reversal of 16689057420 is 2475098661.

It is a self number, because there is not a number n which added to its sum of digits gives 16689057420.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 72877866 + ... + 72878094.

It is an arithmetic number, because the mean of its divisors is an integer number (151275600).

Almost surely, 2^16689057420 is an apocalyptic number.

16689057420 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 16689057420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29044915200).

16689057420 is an abundant number, since it is smaller than the sum of its proper divisors (41400772980).

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

16689057420 is a wasteful number, since it uses less digits than its factorization.

16689057420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 16689057420 in words is "sixteen billion, six hundred eighty-nine million, fifty-seven thousand, four hundred twenty".