519968121642 has 48 divisors (see below), whose sum is σ = 1131364922688. Its totient is φ = 172589616000.

The previous prime is 519968121637. The next prime is 519968121643. The reversal of 519968121642 is 246121869915.

519968121642 is a `hidden beast` number, since 519 + 9 + 6 + 81 + 2 + 1 + 6 + 42 = 666.

It is not an unprimeable number, because it can be changed into a prime (519968121643) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 22140018 + ... + 22163490.

It is an arithmetic number, because the mean of its divisors is an integer number (23570102556).

Almost surely, 2^519968121642 is an apocalyptic number.

519968121642 is an abundant number, since it is smaller than the sum of its proper divisors (611396801046).

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

519968121642 is a wasteful number, since it uses less digits than its factorization.

519968121642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28635 (or 28632 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 519968121642 in words is "five hundred nineteen billion, nine hundred sixty-eight million, one hundred twenty-one thousand, six hundred forty-two".