51864165843661 has 4 divisors (see below), whose sum is σ = 52001010608800. Its totient is φ = 51727321078524.

The previous prime is 51864165843647. The next prime is 51864165843683. The reversal of 51864165843661 is 16634856146815.

51864165843661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51864165843661 - 2¹⁷ = 51864165712589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51864165843593 and 51864165843602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51864165843601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 68422382001 + ... + 68422382758.

It is an arithmetic number, because the mean of its divisors is an integer number (13000252652200).

Almost surely, 2^{51864165843661} is an apocalyptic number.

It is an amenable number.

51864165843661 is a deficient number, since it is larger than the sum of its proper divisors (136844765139).

51864165843661 is a wasteful number, since it uses less digits than its factorization.

51864165843661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136844765138.

The product of its digits is 99532800, while the sum is 64.

The spelling of 51864165843661 in words is "fifty-one trillion, eight hundred sixty-four billion, one hundred sixty-five million, eight hundred forty-three thousand, six hundred sixty-one".