19315506568 has 8 divisors (see below), whose sum is σ = 36216574830. Its totient is φ = 9657753280.

The previous prime is 19315506547. The next prime is 19315506569. The reversal of 19315506568 is 86560551391.

It can be written as a sum of positive squares in only one way, i.e., 9829136164 + 9486370404 = 99142^2 + 97398^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×19315506568² (a number of 21 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 1207219153 + ... + 1207219168.

Almost surely, 2^19315506568 is an apocalyptic number.

It is an amenable number.

19315506568 is a deficient number, since it is larger than the sum of its proper divisors (16901068262).

19315506568 is a wasteful number, since it uses less digits than its factorization.

19315506568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414438327 (or 2414438323 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 19315506568 in words is "nineteen billion, three hundred fifteen million, five hundred six thousand, five hundred sixty-eight".