16398394946820 has 576 divisors, whose sum is σ = 55794106368000. Its totient is φ = 3877073620992.

The previous prime is 16398394946783. The next prime is 16398394946821. The reversal of 16398394946820 is 2864949389361.

16398394946820 is a `hidden beast` number, since 1 + 6 + 3 + 98 + 39 + 49 + 468 + 2 + 0 = 666.

It is a super-2 number, since 2×16398394946820² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (16398394946821) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2329644861 + ... + 2329651899.

It is an arithmetic number, because the mean of its divisors is an integer number (96864768000).

Almost surely, 2^{16398394946820} is an apocalyptic number.

16398394946820 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 16398394946820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27897053184000).

16398394946820 is an abundant number, since it is smaller than the sum of its proper divisors (39395711421180).

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

16398394946820 is a wasteful number, since it uses less digits than its factorization.

16398394946820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7592 (or 7587 counting only the distinct ones).

The product of its (nonzero) digits is 483729408, while the sum is 72.

The spelling of 16398394946820 in words is "sixteen trillion, three hundred ninety-eight billion, three hundred ninety-four million, nine hundred forty-six thousand, eight hundred twenty".