19772185513 has 4 divisors (see below), whose sum is σ = 19967949828. Its totient is φ = 19576421200.

The previous prime is 19772185483. The next prime is 19772185571. The reversal of 19772185513 is 31558127791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31558127791 = 569 ⋅55462439.

It can be written as a sum of positive squares in 2 ways, for example, as 18974236009 + 797949504 = 137747^2 + 28248^2 .

It is a cyclic number.

It is not a de Polignac number, because 19772185513 - 2²¹ = 19770088361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19772185613) 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 3 ways as a sum of consecutive naturals, for example, 97882006 + ... + 97882207.

It is an arithmetic number, because the mean of its divisors is an integer number (4991987457).

Almost surely, 2^19772185513 is an apocalyptic number.

It is an amenable number.

19772185513 is a deficient number, since it is larger than the sum of its proper divisors (195764315).

19772185513 is a wasteful number, since it uses less digits than its factorization.

19772185513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195764314.

The product of its digits is 529200, while the sum is 49.

The spelling of 19772185513 in words is "nineteen billion, seven hundred seventy-two million, one hundred eighty-five thousand, five hundred thirteen".