19898841140640 has 960 divisors, whose sum is σ = 87687956885760. Its totient is φ = 4128540917760.

The previous prime is 19898841140611. The next prime is 19898841140699. The reversal of 19898841140640 is 4604114889891.

19898841140640 is a `hidden beast` number, since 1 + 9 + 89 + 88 + 411 + 4 + 0 + 64 + 0 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 671585346 + ... + 671614974.

It is an arithmetic number, because the mean of its divisors is an integer number (91341621756).

Almost surely, 2^{19898841140640} is an apocalyptic number.

19898841140640 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 19898841140640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43843978442880).

19898841140640 is an abundant number, since it is smaller than the sum of its proper divisors (67789115745120).

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

19898841140640 is a wasteful number, since it uses less digits than its factorization.

19898841140640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30347 (or 30330 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 63.

The spelling of 19898841140640 in words is "nineteen trillion, eight hundred ninety-eight billion, eight hundred forty-one million, one hundred forty thousand, six hundred forty".