19426429549 has 4 divisors (see below), whose sum is σ = 20096306460. Its totient is φ = 18756552640.

The previous prime is 19426429537. The next prime is 19426429577. The reversal of 19426429549 is 94592462491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94592462491 = 8297 ⋅11400803.

It can be written as a sum of positive squares in 2 ways, for example, as 3813927049 + 15612502500 = 61757^2 + 124950^2 .

It is a cyclic number.

It is not a de Polignac number, because 19426429549 - 2⁹ = 19426429037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19426429549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19426429049) 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 3 ways as a sum of consecutive naturals, for example, 334938412 + ... + 334938469.

It is an arithmetic number, because the mean of its divisors is an integer number (5024076615).

Almost surely, 2^19426429549 is an apocalyptic number.

It is an amenable number.

19426429549 is a deficient number, since it is larger than the sum of its proper divisors (669876911).

19426429549 is an equidigital number, since it uses as much as digits as its factorization.

19426429549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669876910.

The product of its digits is 5598720, while the sum is 55.

It can be divided in two parts, 1942 and 6429549, that added together give a triangular number (6431491 = T₃₅₈₆).

The spelling of 19426429549 in words is "nineteen billion, four hundred twenty-six million, four hundred twenty-nine thousand, five hundred forty-nine".