51436235161 has 4 divisors (see below), whose sum is σ = 52690777524. Its totient is φ = 50181692800.

The previous prime is 51436235131. The next prime is 51436235171. The reversal of 51436235161 is 16153263415.

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 11458632025 + 39977603136 = 107045^2 + 199944^2 .

It is a cyclic number.

It is not a de Polignac number, because 51436235161 - 2¹⁷ = 51436104089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51436235161.

It is not an unprimeable number, because it can be changed into a prime (51436235101) 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, 627271120 + ... + 627271201.

It is an arithmetic number, because the mean of its divisors is an integer number (13172694381).

Almost surely, 2^51436235161 is an apocalyptic number.

It is an amenable number.

51436235161 is a deficient number, since it is larger than the sum of its proper divisors (1254542363).

51436235161 is a wasteful number, since it uses less digits than its factorization.

51436235161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254542362.

The product of its digits is 64800, while the sum is 37.

Adding to 51436235161 its reverse (16153263415), we get a palindrome (67589498576).

The spelling of 51436235161 in words is "fifty-one billion, four hundred thirty-six million, two hundred thirty-five thousand, one hundred sixty-one".