51521561017 has 8 divisors (see below), whose sum is σ = 52156921824. Its totient is φ = 50886548448.

The previous prime is 51521560997. The next prime is 51521561059. The reversal of 51521561017 is 71016512515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51521561017 - 2⁷ = 51521560889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51521561417) 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 7 ways as a sum of consecutive naturals, for example, 217173 + ... + 387565.

It is an arithmetic number, because the mean of its divisors is an integer number (6519615228).

Almost surely, 2^51521561017 is an apocalyptic number.

It is an amenable number.

51521561017 is a deficient number, since it is larger than the sum of its proper divisors (635360807).

51521561017 is a wasteful number, since it uses less digits than its factorization.

51521561017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174119.

The product of its (nonzero) digits is 10500, while the sum is 34.

The spelling of 51521561017 in words is "fifty-one billion, five hundred twenty-one million, five hundred sixty-one thousand, seventeen".