16699648665280 has 448 divisors, whose sum is σ = 48373340083200. Its totient is φ = 5363842498560.

The previous prime is 16699648665251. The next prime is 16699648665281. The reversal of 16699648665280 is 8256684699661.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (76).

It is a junction number, because it is equal to n+sod(n) for n = 16699648665197 and 16699648665206.

It is not an unprimeable number, because it can be changed into a prime (16699648665281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2537551590 + ... + 2537558170.

Almost surely, 2^{16699648665280} is an apocalyptic number.

16699648665280 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 16699648665280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24186670041600).

16699648665280 is an abundant number, since it is smaller than the sum of its proper divisors (31673691417920).

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

16699648665280 is a wasteful number, since it uses less digits than its factorization.

16699648665280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7280 (or 7270 counting only the distinct ones).

The product of its (nonzero) digits is 1612431360, while the sum is 76.

The spelling of 16699648665280 in words is "sixteen trillion, six hundred ninety-nine billion, six hundred forty-eight million, six hundred sixty-five thousand, two hundred eighty".