19999434000081 has 16 divisors (see below), whose sum is σ = 26692006017600. Its totient is φ = 13319909637120.

The previous prime is 19999434000067. The next prime is 19999434000251. The reversal of 19999434000081 is 18000043499991.

It is not a de Polignac number, because 19999434000081 - 2²⁵ = 19999400445649 is a prime.

It is a super-2 number, since 2×19999434000081² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19999433999985 and 19999434000030.

It is not an unprimeable number, because it can be changed into a prime (19999434000281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224685921 + ... + 224774913.

It is an arithmetic number, because the mean of its divisors is an integer number (1668250376100).

Almost surely, 2^{19999434000081} is an apocalyptic number.

It is an amenable number.

19999434000081 is a deficient number, since it is larger than the sum of its proper divisors (6692572017519).

19999434000081 is a wasteful number, since it uses less digits than its factorization.

19999434000081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161456.

The product of its (nonzero) digits is 2519424, while the sum is 57.

The spelling of 19999434000081 in words is "nineteen trillion, nine hundred ninety-nine billion, four hundred thirty-four million, eighty-one", and thus it is an aban number.