51106665051605 has 4 divisors (see below), whose sum is σ = 61327998061932. Its totient is φ = 40885332041280.

The previous prime is 51106665051593. The next prime is 51106665051641. The reversal of 51106665051605 is 50615056660115.

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 21973378130929 + 29133286920676 = 4687577^2 + 5397526^2 .

It is not a de Polignac number, because 51106665051605 - 2¹⁴ = 51106665035221 is a prime.

It is a super-2 number, since 2×51106665051605² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51106665051605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5110666505156 + ... + 5110666505165.

It is an arithmetic number, because the mean of its divisors is an integer number (15331999515483).

Almost surely, 2^{51106665051605} is an apocalyptic number.

It is an amenable number.

51106665051605 is a deficient number, since it is larger than the sum of its proper divisors (10221333010327).

51106665051605 is a wasteful number, since it uses less digits than its factorization.

51106665051605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221333010326.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 51106665051605 in words is "fifty-one trillion, one hundred six billion, six hundred sixty-five million, fifty-one thousand, six hundred five".