19801169851320 has 1024 divisors, whose sum is σ = 82127001600000. Its totient is φ = 4171964590080.

The previous prime is 19801169851319. The next prime is 19801169851349. The reversal of 19801169851320 is 2315896110891.

It is a happy number.

19801169851320 is a `hidden beast` number, since 1 + 9 + 8 + 0 + 1 + 16 + 98 + 513 + 20 = 666.

It is a super-2 number, since 2×19801169851320² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 478279981 + ... + 478321379.

It is an arithmetic number, because the mean of its divisors is an integer number (80202150000).

Almost surely, 2^{19801169851320} is an apocalyptic number.

19801169851320 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 19801169851320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41063500800000).

19801169851320 is an abundant number, since it is smaller than the sum of its proper divisors (62325831748680).

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

19801169851320 is a wasteful number, since it uses less digits than its factorization.

19801169851320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41625 (or 41615 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 19801169851320 in words is "nineteen trillion, eight hundred one billion, one hundred sixty-nine million, eight hundred fifty-one thousand, three hundred twenty".