19315850868 has 24 divisors (see below), whose sum is σ = 50078132160. Its totient is φ = 6438616920.

The previous prime is 19315850861. The next prime is 19315850893. The reversal of 19315850868 is 86805851391.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19315850861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89425128 + ... + 89425343.

It is an arithmetic number, because the mean of its divisors is an integer number (2086588840).

Almost surely, 2^19315850868 is an apocalyptic number.

19315850868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19315850868 is an abundant number, since it is smaller than the sum of its proper divisors (30762281292).

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

19315850868 is a wasteful number, since it uses less digits than its factorization.

19315850868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178850484 (or 178850476 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 19315850868 in words is "nineteen billion, three hundred fifteen million, eight hundred fifty thousand, eight hundred sixty-eight".