19429744457 has 8 divisors (see below), whose sum is σ = 19491184776. Its totient is φ = 19368340992.

The previous prime is 19429744447. The next prime is 19429744517. The reversal of 19429744457 is 75444792491.

It can be written as a sum of positive squares in 4 ways, for example, as 5472448576 + 13957295881 = 73976^2 + 118141^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19429744457 - 2⁴ = 19429744441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19429744447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1361483 + ... + 1375679.

It is an arithmetic number, because the mean of its divisors is an integer number (2436398097).

Almost surely, 2^19429744457 is an apocalyptic number.

It is an amenable number.

19429744457 is a deficient number, since it is larger than the sum of its proper divisors (61440319).

19429744457 is a wasteful number, since it uses less digits than its factorization.

19429744457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18427.

The product of its digits is 10160640, while the sum is 56.

The spelling of 19429744457 in words is "nineteen billion, four hundred twenty-nine million, seven hundred forty-four thousand, four hundred fifty-seven".