51724242665 has 8 divisors (see below), whose sum is σ = 62071576008. Its totient is φ = 41377737600.

The previous prime is 51724242643. The next prime is 51724242677. The reversal of 51724242665 is 56624242715.

It can be written as a sum of positive squares in 4 ways, for example, as 4002966361 + 47721276304 = 63269^2 + 218452^2 .

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

It is not a de Polignac number, because 51724242665 - 2¹² = 51724238569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60212 + ... + 327221.

It is an arithmetic number, because the mean of its divisors is an integer number (7758947001).

Almost surely, 2^51724242665 is an apocalyptic number.

It is an amenable number.

51724242665 is a deficient number, since it is larger than the sum of its proper divisors (10347333343).

51724242665 is a wasteful number, since it uses less digits than its factorization.

51724242665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414139.

The product of its digits is 806400, while the sum is 44.

The spelling of 51724242665 in words is "fifty-one billion, seven hundred twenty-four million, two hundred forty-two thousand, six hundred sixty-five".