51521561061 has 16 divisors (see below), whose sum is σ = 70031904000. Its totient is φ = 33685299648.

The previous prime is 51521561059. The next prime is 51521561089. The reversal of 51521561061 is 16016512515.

It is not a de Polignac number, because 51521561061 - 2¹ = 51521561059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521562061) 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 15 ways as a sum of consecutive naturals, for example, 694186 + ... + 764811.

It is an arithmetic number, because the mean of its divisors is an integer number (4376994000).

Almost surely, 2^51521561061 is an apocalyptic number.

It is an amenable number.

51521561061 is a deficient number, since it is larger than the sum of its proper divisors (18510342939).

51521561061 is a wasteful number, since it uses less digits than its factorization.

51521561061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459228.

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 51521561061 in words is "fifty-one billion, five hundred twenty-one million, five hundred sixty-one thousand, sixty-one".