19750448557 has 4 divisors (see below), whose sum is σ = 22571941216. Its totient is φ = 16928955900.

The previous prime is 19750448539. The next prime is 19750448563. The reversal of 19750448557 is 75584405791.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75584405791 = 24923 ⋅3032717.

It is a cyclic number.

It is not a de Polignac number, because 19750448557 - 2³¹ = 17602964909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19750448498 and 19750448507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19750442557) 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, 1410746319 + ... + 1410746332.

It is an arithmetic number, because the mean of its divisors is an integer number (5642985304).

Almost surely, 2^19750448557 is an apocalyptic number.

It is an amenable number.

19750448557 is a deficient number, since it is larger than the sum of its proper divisors (2821492659).

19750448557 is an equidigital number, since it uses as much as digits as its factorization.

19750448557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821492658.

The product of its (nonzero) digits is 7056000, while the sum is 55.

The spelling of 19750448557 in words is "nineteen billion, seven hundred fifty million, four hundred forty-eight thousand, five hundred fifty-seven".