51000165561101 has 4 divisors (see below), whose sum is σ = 51045823722972. Its totient is φ = 50954507399232.

The previous prime is 51000165561089. The next prime is 51000165561109. The reversal of 51000165561101 is 10116556100015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2728935498601 + 48271230062500 = 1651949^2 + 6947750^2 .

It is a cyclic number.

It is not a de Polignac number, because 51000165561101 - 2³⁴ = 50982985691917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000165561109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22829079260 + ... + 22829081493.

It is an arithmetic number, because the mean of its divisors is an integer number (12761455930743).

Almost surely, 2^{51000165561101} is an apocalyptic number.

It is an amenable number.

51000165561101 is a deficient number, since it is larger than the sum of its proper divisors (45658161871).

51000165561101 is a wasteful number, since it uses less digits than its factorization.

51000165561101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45658161870.

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 51000165561101 in words is "fifty-one trillion, one hundred sixty-five million, five hundred sixty-one thousand, one hundred one".