16988781420 has 288 divisors, whose sum is σ = 57345288000. Its totient is φ = 4044515328.

The previous prime is 16988781389. The next prime is 16988781427. The reversal of 16988781420 is 2418788961.

16988781420 is a `hidden beast` number, since 1 + 69 + 8 + 87 + 81 + 420 = 666.

It is not an unprimeable number, because it can be changed into a prime (16988781427) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10966806 + ... + 10968354.

Almost surely, 2^16988781420 is an apocalyptic number.

16988781420 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 16988781420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28672644000).

16988781420 is an abundant number, since it is smaller than the sum of its proper divisors (40356506580).

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

16988781420 is a wasteful number, since it uses less digits than its factorization.

16988781420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 16988781420 in words is "sixteen billion, nine hundred eighty-eight million, seven hundred eighty-one thousand, four hundred twenty".