51006110561 has 4 divisors (see below), whose sum is σ = 58292697792. Its totient is φ = 43719523332.

The previous prime is 51006110549. The next prime is 51006110579. The reversal of 51006110561 is 16501160015.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16501160015 = 5 ⋅3300232003.

It is a cyclic number.

It is not a de Polignac number, because 51006110561 - 2¹⁸ = 51005848417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51006110561.

It is not an unprimeable number, because it can be changed into a prime (51006110501) 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, 3643293605 + ... + 3643293618.

It is an arithmetic number, because the mean of its divisors is an integer number (14573174448).

Almost surely, 2^51006110561 is an apocalyptic number.

It is an amenable number.

51006110561 is a deficient number, since it is larger than the sum of its proper divisors (7286587231).

51006110561 is an equidigital number, since it uses as much as digits as its factorization.

51006110561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7286587230.

The product of its (nonzero) digits is 900, while the sum is 26.

Adding to 51006110561 its reverse (16501160015), we get a palindrome (67507270576).

The spelling of 51006110561 in words is "fifty-one billion, six million, one hundred ten thousand, five hundred sixty-one".