19315620864 has 528 divisors, whose sum is σ = 63089784576. Its totient is φ = 5662310400.

The previous prime is 19315620851. The next prime is 19315620887. The reversal of 19315620864 is 46802651391.

19315620864 is a `hidden beast` number, since 1 + 9 + 3 + 1 + 562 + 0 + 86 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 199130064 + ... + 199130160.

Almost surely, 2^19315620864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19315620864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31544892288).

19315620864 is an abundant number, since it is smaller than the sum of its proper divisors (43774163712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19315620864 is a wasteful number, since it uses less digits than its factorization.

19315620864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 19315620864 in words is "nineteen billion, three hundred fifteen million, six hundred twenty thousand, eight hundred sixty-four".