840519617868 has 144 divisors (see below), whose sum is σ = 2449034864640. Its totient is φ = 238092158592.

The previous prime is 840519617843. The next prime is 840519617881. The reversal of 840519617868 is 868716915048.

840519617868 is a `hidden beast` number, since 8 + 4 + 0 + 5 + 1 + 9 + 617 + 8 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16345005 + ... + 16396347.

It is an arithmetic number, because the mean of its divisors is an integer number (17007186560).

Almost surely, 2^840519617868 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 840519617868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1224517432320).

840519617868 is an abundant number, since it is smaller than the sum of its proper divisors (1608515246772).

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

840519617868 is a wasteful number, since it uses less digits than its factorization.

840519617868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51916 (or 51911 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 63.

The spelling of 840519617868 in words is "eight hundred forty billion, five hundred nineteen million, six hundred seventeen thousand, eight hundred sixty-eight".