51665505155157 has 16 divisors (see below), whose sum is σ = 72068955823872. Its totient is φ = 32888610785280.

The previous prime is 51665505155107. The next prime is 51665505155191. The reversal of 51665505155157 is 75155150556615.

It is not a de Polignac number, because 51665505155157 - 2¹⁹ = 51665504630869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51665505155097 and 51665505155106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665505155107) 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, 4468555468 + ... + 4468567029.

It is an arithmetic number, because the mean of its divisors is an integer number (4504309738992).

Almost surely, 2^{51665505155157} is an apocalyptic number.

It is an amenable number.

51665505155157 is a deficient number, since it is larger than the sum of its proper divisors (20403450668715).

51665505155157 is a wasteful number, since it uses less digits than its factorization.

51665505155157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8937122588.

The product of its (nonzero) digits is 19687500, while the sum is 57.

The spelling of 51665505155157 in words is "fifty-one trillion, six hundred sixty-five billion, five hundred five million, one hundred fifty-five thousand, one hundred fifty-seven".