51110101055561 has 4 divisors (see below), whose sum is σ = 51725885405712. Its totient is φ = 50494316705412.

The previous prime is 51110101055443. The next prime is 51110101055597. The reversal of 51110101055561 is 16555010101115.

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 51110101055561 - 2³⁰ = 51109027313737 is a prime.

It is a super-2 number, since 2×51110101055561² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51110601055561) 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, 307892174951 + ... + 307892175116.

It is an arithmetic number, because the mean of its divisors is an integer number (12931471351428).

Almost surely, 2^{51110101055561} is an apocalyptic number.

It is an amenable number.

51110101055561 is a deficient number, since it is larger than the sum of its proper divisors (615784350151).

51110101055561 is an equidigital number, since it uses as much as digits as its factorization.

51110101055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615784350150.

The product of its (nonzero) digits is 3750, while the sum is 32.

Adding to 51110101055561 its reverse (16555010101115), we get a palindrome (67665111156676).

The spelling of 51110101055561 in words is "fifty-one trillion, one hundred ten billion, one hundred one million, fifty-five thousand, five hundred sixty-one".