19933491645481 has 2 divisors, whose sum is σ = 19933491645482. Its totient is φ = 19933491645480.

The previous prime is 19933491645467. The next prime is 19933491645499. The reversal of 19933491645481 is 18454619433991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14443678634256 + 5489813011225 = 3800484^2 + 2343035^2 .

It is a cyclic number.

It is not a de Polignac number, because 19933491645481 - 2³⁵ = 19899131907113 is a prime.

It is a super-2 number, since 2×19933491645481² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19933491645421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9966745822740 + 9966745822741.

It is an arithmetic number, because the mean of its divisors is an integer number (9966745822741).

Almost surely, 2^{19933491645481} is an apocalyptic number.

It is an amenable number.

19933491645481 is a deficient number, since it is larger than the sum of its proper divisors (1).

19933491645481 is an equidigital number, since it uses as much as digits as its factorization.

19933491645481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100776960, while the sum is 67.

The spelling of 19933491645481 in words is "nineteen trillion, nine hundred thirty-three billion, four hundred ninety-one million, six hundred forty-five thousand, four hundred eighty-one".