19963831439640 has 512 divisors, whose sum is σ = 68262430924800. Its totient is φ = 4628195328000.

The previous prime is 19963831439627. The next prime is 19963831439711. The reversal of 19963831439640 is 4693413836991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 967276441 + ... + 967297079.

It is an arithmetic number, because the mean of its divisors is an integer number (133325060400).

Almost surely, 2^{19963831439640} is an apocalyptic number.

19963831439640 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 19963831439640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34131215462400).

19963831439640 is an abundant number, since it is smaller than the sum of its proper divisors (48298599485160).

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

19963831439640 is a wasteful number, since it uses less digits than its factorization.

19963831439640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21059 (or 21055 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 66.

The spelling of 19963831439640 in words is "nineteen trillion, nine hundred sixty-three billion, eight hundred thirty-one million, four hundred thirty-nine thousand, six hundred forty".