19144429340581 has 4 divisors (see below), whose sum is σ = 19145043349164. Its totient is φ = 19143815332000.

The previous prime is 19144429340563. The next prime is 19144429340591. The reversal of 19144429340581 is 18504392444191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 672742803681 + 18471686536900 = 820209^2 + 4297870^2 .

It is a cyclic number.

It is not a de Polignac number, because 19144429340581 - 2¹³ = 19144429332389 is a prime.

It is a super-2 number, since 2×19144429340581² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19144429340591) 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, 306957520 + ... + 307019881.

It is an arithmetic number, because the mean of its divisors is an integer number (4786260837291).

Almost surely, 2^{19144429340581} is an apocalyptic number.

It is an amenable number.

19144429340581 is a deficient number, since it is larger than the sum of its proper divisors (614008583).

19144429340581 is an equidigital number, since it uses as much as digits as its factorization.

19144429340581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614008582.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 19144429340581 in words is "nineteen trillion, one hundred forty-four billion, four hundred twenty-nine million, three hundred forty thousand, five hundred eighty-one".