19439144057 has 8 divisors (see below), whose sum is σ = 19538061192. Its totient is φ = 19340464000.

The previous prime is 19439144047. The next prime is 19439144083. The reversal of 19439144057 is 75044193491.

It can be written as a sum of positive squares in 4 ways, for example, as 654796921 + 18784347136 = 25589^2 + 137056^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19439144057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19439144047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106307 + ... + 224007.

It is an arithmetic number, because the mean of its divisors is an integer number (2442257649).

Almost surely, 2^19439144057 is an apocalyptic number.

It is an amenable number.

19439144057 is a deficient number, since it is larger than the sum of its proper divisors (98917135).

19439144057 is a wasteful number, since it uses less digits than its factorization.

19439144057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118539.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 19439144057 in words is "nineteen billion, four hundred thirty-nine million, one hundred forty-four thousand, fifty-seven".