16921808006456 has 128 divisors (see below), whose sum is σ = 35672207155200. Its totient is φ = 7478207815680.

The previous prime is 16921808006359. The next prime is 16921808006459. The reversal of 16921808006456 is 65460080812961.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16921808006459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389513696 + ... + 389557136.

It is an arithmetic number, because the mean of its divisors is an integer number (278689118400).

Almost surely, 2^{16921808006456} is an apocalyptic number.

It is an amenable number.

16921808006456 is an abundant number, since it is smaller than the sum of its proper divisors (18750399148744).

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

16921808006456 is a wasteful number, since it uses less digits than its factorization.

16921808006456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44797 (or 44793 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 56.

The spelling of 16921808006456 in words is "sixteen trillion, nine hundred twenty-one billion, eight hundred eight million, six thousand, four hundred fifty-six".