19946542619081 has 16 divisors (see below), whose sum is σ = 21694388880528. Its totient is φ = 18229209600000.

The previous prime is 19946542619071. The next prime is 19946542619183. The reversal of 19946542619081 is 18091624564991.

It can be written as a sum of positive squares in 8 ways, for example, as 5388433690000 + 14558108929081 = 2321300^2 + 3815509^2 .

It is a cyclic number.

It is not a de Polignac number, because 19946542619081 - 2²⁶ = 19946475510217 is a prime.

It is a super-2 number, since 2×19946542619081² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19946542618999 and 19946542619017.

It is not an unprimeable number, because it can be changed into a prime (19946542619071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36494045 + ... + 37036581.

It is an arithmetic number, because the mean of its divisors is an integer number (1355899305033).

Almost surely, 2^{19946542619081} is an apocalyptic number.

It is an amenable number.

19946542619081 is a deficient number, since it is larger than the sum of its proper divisors (1747846261447).

19946542619081 is a wasteful number, since it uses less digits than its factorization.

19946542619081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570652.

The product of its (nonzero) digits is 33592320, while the sum is 65.

The spelling of 19946542619081 in words is "nineteen trillion, nine hundred forty-six billion, five hundred forty-two million, six hundred nineteen thousand, eighty-one".