51130012165 has 4 divisors (see below), whose sum is σ = 61356014604. Its totient is φ = 40904009728.

The previous prime is 51130012163. The next prime is 51130012273. The reversal of 51130012165 is 56121003115.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56121003115 = 5 ⋅11224200623.

It can be written as a sum of positive squares in 2 ways, for example, as 20564133604 + 30565878561 = 143402^2 + 174831^2 .

It is a cyclic number.

It is not a de Polignac number, because 51130012165 - 2¹ = 51130012163 is a prime.

It is a super-2 number, since 2×51130012165² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51130012163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5113001212 + ... + 5113001221.

It is an arithmetic number, because the mean of its divisors is an integer number (15339003651).

Almost surely, 2^51130012165 is an apocalyptic number.

It is an amenable number.

51130012165 is a deficient number, since it is larger than the sum of its proper divisors (10226002439).

51130012165 is a wasteful number, since it uses less digits than its factorization.

51130012165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10226002438.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 51130012165 in words is "fifty-one billion, one hundred thirty million, twelve thousand, one hundred sixty-five".