509877421556 has 6 divisors (see below), whose sum is σ = 892285487730. Its totient is φ = 254938710776.

The previous prime is 509877421541. The next prime is 509877421579. The reversal of 509877421556 is 655124778905.

It can be written as a sum of positive squares in only one way, i.e., 455579101156 + 54298320400 = 674966^2 + 233020^2 .

It is a super-2 number, since 2×509877421556² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 509877421495 and 509877421504.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 63734677691 + ... + 63734677698.

It is an arithmetic number, because the mean of its divisors is an integer number (148714247955).

Almost surely, 2^509877421556 is an apocalyptic number.

It is an amenable number.

509877421556 is a deficient number, since it is larger than the sum of its proper divisors (382408066174).

509877421556 is a wasteful number, since it uses less digits than its factorization.

509877421556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127469355393 (or 127469355391 counting only the distinct ones).

The product of its (nonzero) digits is 21168000, while the sum is 59.

The spelling of 509877421556 in words is "five hundred nine billion, eight hundred seventy-seven million, four hundred twenty-one thousand, five hundred fifty-six".