501212857681 has 8 divisors (see below), whose sum is σ = 519060283200. Its totient is φ = 483403047120.

The previous prime is 501212857643. The next prime is 501212857703. The reversal of 501212857681 is 186758212105.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 501212857681 - 2¹⁵ = 501212824913 is a prime.

It is a super-2 number, since 2×501212857681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501212857601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9376615 + ... + 9429916.

It is an arithmetic number, because the mean of its divisors is an integer number (64882535400).

Almost surely, 2^501212857681 is an apocalyptic number.

It is an amenable number.

501212857681 is a deficient number, since it is larger than the sum of its proper divisors (17847425519).

501212857681 is a wasteful number, since it uses less digits than its factorization.

501212857681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18807479.

The product of its (nonzero) digits is 268800, while the sum is 46.

The spelling of 501212857681 in words is "five hundred one billion, two hundred twelve million, eight hundred fifty-seven thousand, six hundred eighty-one".