51326611466513 has 4 divisors (see below), whose sum is σ = 51326645671860. Its totient is φ = 51326577261168.

The previous prime is 51326611466453. The next prime is 51326611466549. The reversal of 51326611466513 is 31566411662315.

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 19253780495569 + 32072830970944 = 4387913^2 + 5663288^2 .

It is a cyclic number.

It is not a de Polignac number, because 51326611466513 - 2¹⁴ = 51326611450129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51326611466413) 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, 14743370 + ... + 17889107.

It is an arithmetic number, because the mean of its divisors is an integer number (12831661417965).

Almost surely, 2^{51326611466513} is an apocalyptic number.

It is an amenable number.

51326611466513 is a deficient number, since it is larger than the sum of its proper divisors (34205347).

51326611466513 is a wasteful number, since it uses less digits than its factorization.

51326611466513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34205346.

The product of its digits is 2332800, while the sum is 50.

The spelling of 51326611466513 in words is "fifty-one trillion, three hundred twenty-six billion, six hundred eleven million, four hundred sixty-six thousand, five hundred thirteen".