16785425664 has 648 divisors, whose sum is σ = 61865012160. Its totient is φ = 4396861440.

The previous prime is 16785425627. The next prime is 16785425689. The reversal of 16785425664 is 46652458761.

16785425664 is a `hidden beast` number, since 1 + 6 + 78 + 5 + 4 + 2 + 566 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 16785425664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 541465329 + ... + 541465359.

Almost surely, 2^16785425664 is an apocalyptic number.

16785425664 is a gapful number since it is divisible by the number (14) 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 16785425664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30932506080).

16785425664 is an abundant number, since it is smaller than the sum of its proper divisors (45079586496).

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

16785425664 is an equidigital number, since it uses as much as digits as its factorization.

16785425664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 62 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

The spelling of 16785425664 in words is "sixteen billion, seven hundred eighty-five million, four hundred twenty-five thousand, six hundred sixty-four".