501991291960 has 64 divisors (see below), whose sum is σ = 1136694928320. Its totient is φ = 199514895360.

The previous prime is 501991291943. The next prime is 501991291987. The reversal of 501991291960 is 69192199105.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 501991291898 and 501991291907.

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 15 ways as a sum of consecutive naturals, for example, 18536830 + ... + 18563890.

It is an arithmetic number, because the mean of its divisors is an integer number (17760858255).

Almost surely, 2^501991291960 is an apocalyptic number.

It is an amenable number.

501991291960 is an abundant number, since it is smaller than the sum of its proper divisors (634703636360).

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

501991291960 is a wasteful number, since it uses less digits than its factorization.

501991291960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30016 (or 30012 counting only the distinct ones).

The product of its (nonzero) digits is 393660, while the sum is 52.

The spelling of 501991291960 in words is "five hundred one billion, nine hundred ninety-one million, two hundred ninety-one thousand, nine hundred sixty".