16687478808 has 864 divisors, whose sum is σ = 64903063680. Its totient is φ = 3832012800.

The previous prime is 16687478807. The next prime is 16687478831. The reversal of 16687478808 is 80887478661.

16687478808 is a `hidden beast` number, since 1 + 6 + 6 + 87 + 478 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16687478803) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 172035816 + ... + 172035912.

Almost surely, 2^16687478808 is an apocalyptic number.

16687478808 is a gapful number since it is divisible by the number (18) 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 16687478808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32451531840).

16687478808 is an abundant number, since it is smaller than the sum of its proper divisors (48215584872).

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

16687478808 is a wasteful number, since it uses less digits than its factorization.

16687478808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 28901376, while the sum is 63.

The spelling of 16687478808 in words is "sixteen billion, six hundred eighty-seven million, four hundred seventy-eight thousand, eight hundred eight".