19955434657716 has 240 divisors, whose sum is σ = 54204597038592. Its totient is φ = 6394979808000.

The previous prime is 19955434657693. The next prime is 19955434657733. The reversal of 19955434657716 is 61775643455991.

19955434657716 is a `hidden beast` number, since 1 + 9 + 9 + 5 + 5 + 4 + 3 + 46 + 577 + 1 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1387039075 + ... + 1387053461.

Almost surely, 2^{19955434657716} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19955434657716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27102298519296).

19955434657716 is an abundant number, since it is smaller than the sum of its proper divisors (34249162380876).

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

19955434657716 is a wasteful number, since it uses less digits than its factorization.

19955434657716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15332 (or 15321 counting only the distinct ones).

The product of its digits is 857304000, while the sum is 72.

The spelling of 19955434657716 in words is "nineteen trillion, nine hundred fifty-five billion, four hundred thirty-four million, six hundred fifty-seven thousand, seven hundred sixteen".