51110051010561 has 24 divisors (see below), whose sum is σ = 76761916984480. Its totient is φ = 33983463935232.

The previous prime is 51110051010547. The next prime is 51110051010563. The reversal of 51110051010561 is 16501015001115.

51110051010561 is a `hidden beast` number, since 51 + 1 + 1 + 0 + 0 + 51 + 0 + 1 + 0 + 561 = 666.

It is not a de Polignac number, because 51110051010561 - 2¹³ = 51110051002369 is a prime.

It is a super-2 number, since 2×51110051010561² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51110051010563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 277387360 + ... + 277571553.

Almost surely, 2^{51110051010561} is an apocalyptic number.

It is an amenable number.

51110051010561 is a deficient number, since it is larger than the sum of its proper divisors (25651865973919).

51110051010561 is an equidigital number, since it uses as much as digits as its factorization.

51110051010561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554959307 (or 554959295 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 27.

Adding to 51110051010561 its reverse (16501015001115), we get a palindrome (67611066011676).

The spelling of 51110051010561 in words is "fifty-one trillion, one hundred ten billion, fifty-one million, ten thousand, five hundred sixty-one".