51106005505 has 4 divisors (see below), whose sum is σ = 61327206612. Its totient is φ = 40884804400.

The previous prime is 51106005469. The next prime is 51106005529. The reversal of 51106005505 is 50550060115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50550060115 = 5 ⋅10110012023.

It can be written as a sum of positive squares in 2 ways, for example, as 30112313841 + 20993691664 = 173529^2 + 144892^2 .

It is not a de Polignac number, because 51106005505 - 2¹⁵ = 51105972737 is a prime.

It is a super-2 number, since 2×51106005505² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5110600546 + ... + 5110600555.

It is an arithmetic number, because the mean of its divisors is an integer number (15331801653).

Almost surely, 2^51106005505 is an apocalyptic number.

It is an amenable number.

51106005505 is a deficient number, since it is larger than the sum of its proper divisors (10221201107).

51106005505 is a wasteful number, since it uses less digits than its factorization.

51106005505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221201106.

The product of its (nonzero) digits is 3750, while the sum is 28.

The spelling of 51106005505 in words is "fifty-one billion, one hundred six million, five thousand, five hundred five".