19315506561 has 16 divisors (see below), whose sum is σ = 28380090816. Its totient is φ = 11610035136.

The previous prime is 19315506547. The next prime is 19315506569. The reversal of 19315506561 is 16560551391.

It is a de Polignac number, because none of the positive numbers 2^k-19315506561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19315506569) 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 15 ways as a sum of consecutive naturals, for example, 5757270 + ... + 5760623.

It is an arithmetic number, because the mean of its divisors is an integer number (1773755676).

Almost surely, 2^19315506561 is an apocalyptic number.

It is an amenable number.

19315506561 is a deficient number, since it is larger than the sum of its proper divisors (9064584255).

19315506561 is a wasteful number, since it uses less digits than its factorization.

19315506561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11517952.

The product of its (nonzero) digits is 121500, while the sum is 42.

The spelling of 19315506561 in words is "nineteen billion, three hundred fifteen million, five hundred six thousand, five hundred sixty-one".