19550957813 has 4 divisors (see below), whose sum is σ = 19826323488. Its totient is φ = 19275592140.

The previous prime is 19550957807. The next prime is 19550957837. The reversal of 19550957813 is 31875905591.

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: 31875905591 = 9749 ⋅3269659.

It is a cyclic number.

It is not a de Polignac number, because 19550957813 - 2¹⁴ = 19550941429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19550957873) 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, 137682731 + ... + 137682872.

It is an arithmetic number, because the mean of its divisors is an integer number (4956580872).

Almost surely, 2^19550957813 is an apocalyptic number.

It is an amenable number.

19550957813 is a deficient number, since it is larger than the sum of its proper divisors (275365675).

19550957813 is an equidigital number, since it uses as much as digits as its factorization.

19550957813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275365674.

The product of its (nonzero) digits is 1701000, while the sum is 53.

The spelling of 19550957813 in words is "nineteen billion, five hundred fifty million, nine hundred fifty-seven thousand, eight hundred thirteen".