51017227561 has 4 divisors (see below), whose sum is σ = 51038496000. Its totient is φ = 50995959124.

The previous prime is 51017227553. The next prime is 51017227577. The reversal of 51017227561 is 16572271015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51017227561 - 2³ = 51017227553 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 51017227561.

It is not an unprimeable number, because it can be changed into a prime (51017227661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10630621 + ... + 10635418.

It is an arithmetic number, because the mean of its divisors is an integer number (12759624000).

Almost surely, 2^51017227561 is an apocalyptic number.

It is an amenable number.

51017227561 is a deficient number, since it is larger than the sum of its proper divisors (21268439).

51017227561 is a wasteful number, since it uses less digits than its factorization.

51017227561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21268438.

The product of its (nonzero) digits is 29400, while the sum is 37.

Adding to 51017227561 its reverse (16572271015), we get a palindrome (67589498576).

The spelling of 51017227561 in words is "fifty-one billion, seventeen million, two hundred twenty-seven thousand, five hundred sixty-one".