51665505155173 has 32 divisors (see below), whose sum is σ = 67590783396864. Its totient is φ = 38323898744832.

The previous prime is 51665505155107. The next prime is 51665505155191. The reversal of 51665505155173 is 37155150556615.

It is a cyclic number.

It is not a de Polignac number, because 51665505155173 - 2⁹ = 51665505154661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665505135173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64577565 + ... + 65372722.

It is an arithmetic number, because the mean of its divisors is an integer number (2112211981152).

Almost surely, 2^{51665505155173} is an apocalyptic number.

It is an amenable number.

51665505155173 is a deficient number, since it is larger than the sum of its proper divisors (15925278241691).

51665505155173 is a wasteful number, since it uses less digits than its factorization.

51665505155173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129950581.

The product of its (nonzero) digits is 11812500, while the sum is 55.

The spelling of 51665505155173 in words is "fifty-one trillion, six hundred sixty-five billion, five hundred five million, one hundred fifty-five thousand, one hundred seventy-three".