51555155565 has 16 divisors (see below), whose sum is σ = 85332672000. Its totient is φ = 26547941952.

The previous prime is 51555155563. The next prime is 51555155627. The reversal of 51555155565 is 56555155515.

51555155565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51555155565 - 2¹ = 51555155563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555155563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59258365 + ... + 59259234.

It is an arithmetic number, because the mean of its divisors is an integer number (5333292000).

Almost surely, 2^51555155565 is an apocalyptic number.

It is an amenable number.

51555155565 is a deficient number, since it is larger than the sum of its proper divisors (33777516435).

51555155565 is a wasteful number, since it uses less digits than its factorization.

51555155565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118517636.

The product of its digits is 2343750, while the sum is 48.

The spelling of 51555155565 in words is "fifty-one billion, five hundred fifty-five million, one hundred fifty-five thousand, five hundred sixty-five".