19008906430081 has 4 divisors (see below), whose sum is σ = 19009213726464. Its totient is φ = 19008599133700.

The previous prime is 19008906430069. The next prime is 19008906430127. The reversal of 19008906430081 is 18003460980091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19008906430081 - 2²³ = 19008898041473 is a prime.

It is a super-2 number, since 2×19008906430081² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19008906430021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153555385 + ... + 153679126.

It is an arithmetic number, because the mean of its divisors is an integer number (4752303431616).

Almost surely, 2^{19008906430081} is an apocalyptic number.

It is an amenable number.

19008906430081 is a deficient number, since it is larger than the sum of its proper divisors (307296383).

19008906430081 is an equidigital number, since it uses as much as digits as its factorization.

19008906430081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307296382.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 19008906430081 in words is "nineteen trillion, eight billion, nine hundred six million, four hundred thirty thousand, eighty-one".