51113798561 has 8 divisors (see below), whose sum is σ = 61851991680. Its totient is φ = 41234660928.

The previous prime is 51113798551. The next prime is 51113798573. The reversal of 51113798561 is 16589731115.

It is a happy number.

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 51113798561 - 2⁶ = 51113798497 is a prime.

It is a super-3 number, since 3×51113798561³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51113798501) 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, 214763741 + ... + 214763978.

It is an arithmetic number, because the mean of its divisors is an integer number (7731498960).

Almost surely, 2^51113798561 is an apocalyptic number.

It is an amenable number.

51113798561 is a deficient number, since it is larger than the sum of its proper divisors (10738193119).

51113798561 is a wasteful number, since it uses less digits than its factorization.

51113798561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429527743.

The product of its digits is 226800, while the sum is 47.

The spelling of 51113798561 in words is "fifty-one billion, one hundred thirteen million, seven hundred ninety-eight thousand, five hundred sixty-one".