51513204653 has 8 divisors (see below), whose sum is σ = 54737502840. Its totient is φ = 48310474240.

The previous prime is 51513204637. The next prime is 51513204661. The reversal of 51513204653 is 35640231515.

It can be written as a sum of positive squares in 4 ways, for example, as 18533555044 + 32979649609 = 136138^2 + 181603^2 .

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 51513204653 - 2⁴ = 51513204637 is a prime.

It is a super-2 number, since 2×51513204653² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51513204623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5387018 + ... + 5396571.

It is an arithmetic number, because the mean of its divisors is an integer number (6842187855).

Almost surely, 2^51513204653 is an apocalyptic number.

It is an amenable number.

51513204653 is a deficient number, since it is larger than the sum of its proper divisors (3224298187).

51513204653 is a wasteful number, since it uses less digits than its factorization.

51513204653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10783887.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 51513204653 in words is "fifty-one billion, five hundred thirteen million, two hundred four thousand, six hundred fifty-three".