19505615125 has 16 divisors (see below), whose sum is σ = 25774952112. Its totient is φ = 14686579200.

The previous prime is 19505615123. The next prime is 19505615141. The reversal of 19505615125 is 52151650591.

It can be written as a sum of positive squares in 8 ways, for example, as 224070961 + 19281544164 = 14969^2 + 138858^2 .

It is not a de Polignac number, because 19505615125 - 2¹ = 19505615123 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 (19505615123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4587432 + ... + 4591681.

It is an arithmetic number, because the mean of its divisors is an integer number (1610934507).

Almost surely, 2^19505615125 is an apocalyptic number.

It is an amenable number.

19505615125 is a deficient number, since it is larger than the sum of its proper divisors (6269336987).

19505615125 is an equidigital number, since it uses as much as digits as its factorization.

19505615125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9179145 (or 9179135 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 40.

The spelling of 19505615125 in words is "nineteen billion, five hundred five million, six hundred fifteen thousand, one hundred twenty-five".