51335606165 has 4 divisors (see below), whose sum is σ = 61602727404. Its totient is φ = 41068484928.

The previous prime is 51335606149. The next prime is 51335606177. The reversal of 51335606165 is 56160653315.

It is a happy number.

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 31289010769 + 20046595396 = 176887^2 + 141586^2 .

It is a cyclic number.

It is not a de Polignac number, because 51335606165 - 2⁴ = 51335606149 is a prime.

It is a super-3 number, since 3×51335606165³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5133560612 + ... + 5133560621.

It is an arithmetic number, because the mean of its divisors is an integer number (15400681851).

Almost surely, 2^51335606165 is an apocalyptic number.

It is an amenable number.

51335606165 is a deficient number, since it is larger than the sum of its proper divisors (10267121239).

51335606165 is a wasteful number, since it uses less digits than its factorization.

51335606165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10267121238.

The product of its (nonzero) digits is 243000, while the sum is 41.

The spelling of 51335606165 in words is "fifty-one billion, three hundred thirty-five million, six hundred six thousand, one hundred sixty-five".