51660565001 has 4 divisors (see below), whose sum is σ = 51793368900. Its totient is φ = 51527761104.

The previous prime is 51660564929. The next prime is 51660565007. The reversal of 51660565001 is 10056506615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6259183225 + 45401381776 = 79115^2 + 213076^2 .

It is a cyclic number.

It is not a de Polignac number, because 51660565001 - 2¹⁸ = 51660302857 is a prime.

It is a super-2 number, since 2×51660565001² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51660565007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66401366 + ... + 66402143.

It is an arithmetic number, because the mean of its divisors is an integer number (12948342225).

Almost surely, 2^51660565001 is an apocalyptic number.

It is an amenable number.

51660565001 is a deficient number, since it is larger than the sum of its proper divisors (132803899).

51660565001 is a wasteful number, since it uses less digits than its factorization.

51660565001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132803898.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 51660565001 in words is "fifty-one billion, six hundred sixty million, five hundred sixty-five thousand, one".