16399817280 has 1176 divisors, whose sum is σ = 74438231616. Its totient is φ = 3366696960.

The previous prime is 16399817279. The next prime is 16399817293. The reversal of 16399817280 is 8271899361.

16399817280 is a `hidden beast` number, since 1 + 6 + 399 + 8 + 172 + 80 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 197588119 + ... + 197588201.

It is an arithmetic number, because the mean of its divisors is an integer number (63297816).

Almost surely, 2^16399817280 is an apocalyptic number.

16399817280 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 16399817280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37219115808).

16399817280 is an abundant number, since it is smaller than the sum of its proper divisors (58038414336).

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

16399817280 is an equidigital number, since it uses as much as digits as its factorization.

16399817280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 16399817280 in words is "sixteen billion, three hundred ninety-nine million, eight hundred seventeen thousand, two hundred eighty".