51665505155145 has 48 divisors (see below), whose sum is σ = 103093963240320. Its totient is φ = 23446118691072.

The previous prime is 51665505155107. The next prime is 51665505155191. The reversal of 51665505155145 is 54155150556615.

51665505155145 is a `hidden beast` number, since 5 + 1 + 6 + 65 + 50 + 5 + 15 + 514 + 5 = 666.

51665505155145 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 51665505155145 - 2⁸ = 51665505154889 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51665505155091 and 51665505155100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 598560775 + ... + 598647084.

It is an arithmetic number, because the mean of its divisors is an integer number (2147790900840).

Almost surely, 2^{51665505155145} is an apocalyptic number.

It is an amenable number.

51665505155145 is a deficient number, since it is larger than the sum of its proper divisors (51428458085175).

51665505155145 is a wasteful number, since it uses less digits than its factorization.

51665505155145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197208014 (or 1197208011 counting only the distinct ones).

The product of its (nonzero) digits is 11250000, while the sum is 54.

The spelling of 51665505155145 in words is "fifty-one trillion, six hundred sixty-five billion, five hundred five million, one hundred fifty-five thousand, one hundred forty-five".