51546395521 has 4 divisors (see below), whose sum is σ = 54578536452. Its totient is φ = 48514254592.

The previous prime is 51546395503. The next prime is 51546395533. The reversal of 51546395521 is 12559364515.

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 41763009600 + 9783385921 = 204360^2 + 98911^2 .

It is a cyclic number.

It is not a de Polignac number, because 51546395521 - 2⁵ = 51546395489 is a prime.

It is a super-2 number, since 2×51546395521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51546305521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516070440 + ... + 1516070473.

It is an arithmetic number, because the mean of its divisors is an integer number (13644634113).

Almost surely, 2^51546395521 is an apocalyptic number.

It is an amenable number.

51546395521 is a deficient number, since it is larger than the sum of its proper divisors (3032140931).

51546395521 is a wasteful number, since it uses less digits than its factorization.

51546395521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032140930.

The product of its digits is 810000, while the sum is 46.

The spelling of 51546395521 in words is "fifty-one billion, five hundred forty-six million, three hundred ninety-five thousand, five hundred twenty-one".