506776644721 has 8 divisors (see below), whose sum is σ = 508757888744. Its totient is φ = 504796492800.

The previous prime is 506776644683. The next prime is 506776644727. The reversal of 506776644721 is 127446677605.

It can be written as a sum of positive squares in 4 ways, for example, as 242260840000 + 264515804721 = 492200^2 + 514311^2 .

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 506776644721 - 2²¹ = 506774547569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506776644727) 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, 663121 + ... + 1205521.

It is an arithmetic number, because the mean of its divisors is an integer number (63594736093).

Almost surely, 2^506776644721 is an apocalyptic number.

It is an amenable number.

506776644721 is a deficient number, since it is larger than the sum of its proper divisors (1981244023).

506776644721 is a wasteful number, since it uses less digits than its factorization.

506776644721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546051.

The product of its (nonzero) digits is 11854080, while the sum is 55.

The spelling of 506776644721 in words is "five hundred six billion, seven hundred seventy-six million, six hundred forty-four thousand, seven hundred twenty-one".