19999668642240 has 224 divisors, whose sum is σ = 73488838625280. Its totient is φ = 4513487486976.

The previous prime is 19999668642211. The next prime is 19999668642271. The reversal of 19999668642240 is 4224686699991.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×19999668642240² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18305457 + ... + 19367216.

Almost surely, 2^{19999668642240} is an apocalyptic number.

19999668642240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19999668642240 is an abundant number, since it is smaller than the sum of its proper divisors (53489169983040).

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

19999668642240 is a wasteful number, since it uses less digits than its factorization.

19999668642240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37672779 (or 37672769 counting only the distinct ones).

The product of its (nonzero) digits is 725594112, while the sum is 75.

The spelling of 19999668642240 in words is "nineteen trillion, nine hundred ninety-nine billion, six hundred sixty-eight million, six hundred forty-two thousand, two hundred forty".