51234205336261 has 4 divisors (see below), whose sum is σ = 51578059063500. Its totient is φ = 50890351609024.

The previous prime is 51234205336241. The next prime is 51234205336267. The reversal of 51234205336261 is 16263350243215.

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 8377464528225 + 42856740808036 = 2894385^2 + 6546506^2 .

It is a cyclic number.

It is not a de Polignac number, because 51234205336261 - 2⁷ = 51234205336133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51234205336267) 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, 171926863396 + ... + 171926863693.

It is an arithmetic number, because the mean of its divisors is an integer number (12894514765875).

Almost surely, 2^{51234205336261} is an apocalyptic number.

It is an amenable number.

51234205336261 is a deficient number, since it is larger than the sum of its proper divisors (343853727239).

51234205336261 is a wasteful number, since it uses less digits than its factorization.

51234205336261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343853727238.

The product of its (nonzero) digits is 777600, while the sum is 43.

Adding to 51234205336261 its reverse (16263350243215), we get a palindrome (67497555579476).

The spelling of 51234205336261 in words is "fifty-one trillion, two hundred thirty-four billion, two hundred five million, three hundred thirty-six thousand, two hundred sixty-one".