506556641028781 has 8 divisors (see below), whose sum is σ = 579006303382080. Its totient is φ = 434128085655648.

The previous prime is 506556641028679. The next prime is 506556641028797. The reversal of 506556641028781 is 187820146655605.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506556641028781 is a prime.

It is a super-2 number, since 2×506556641028781² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506556641028881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5276693611 + ... + 5276789608.

It is an arithmetic number, because the mean of its divisors is an integer number (72375787922760).

Almost surely, 2^{506556641028781} is an apocalyptic number.

It is an amenable number.

506556641028781 is a deficient number, since it is larger than the sum of its proper divisors (72449662353299).

506556641028781 is a wasteful number, since it uses less digits than its factorization.

506556641028781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10553490083.

The product of its (nonzero) digits is 96768000, while the sum is 64.

The spelling of 506556641028781 in words is "five hundred six trillion, five hundred fifty-six billion, six hundred forty-one million, twenty-eight thousand, seven hundred eighty-one".