19401765133 has 2 divisors, whose sum is σ = 19401765134. Its totient is φ = 19401765132.

The previous prime is 19401765079. The next prime is 19401765179. The reversal of 19401765133 is 33156710491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19310715369 + 91049764 = 138963^2 + 9542^2 .

It is a cyclic number.

It is not a de Polignac number, because 19401765133 - 2³³ = 10811830541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19401765193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9700882566 + 9700882567.

It is an arithmetic number, because the mean of its divisors is an integer number (9700882567).

Almost surely, 2^19401765133 is an apocalyptic number.

It is an amenable number.

19401765133 is a deficient number, since it is larger than the sum of its proper divisors (1).

19401765133 is an equidigital number, since it uses as much as digits as its factorization.

19401765133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The spelling of 19401765133 in words is "nineteen billion, four hundred one million, seven hundred sixty-five thousand, one hundred thirty-three".