51012320557 has 8 divisors (see below), whose sum is σ = 55652208192. Its totient is φ = 46372833600.

The previous prime is 51012320551. The next prime is 51012320561. The reversal of 51012320557 is 75502321015.

51012320557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51012320557 is a prime.

It is a super-2 number, since 2×51012320557² (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 (51012320551) 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, 207013 + ... + 380629.

It is an arithmetic number, because the mean of its divisors is an integer number (6956526024).

Almost surely, 2^51012320557 is an apocalyptic number.

It is an amenable number.

51012320557 is a deficient number, since it is larger than the sum of its proper divisors (4639887635).

51012320557 is a wasteful number, since it uses less digits than its factorization.

51012320557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200339.

The product of its (nonzero) digits is 10500, while the sum is 31.

The spelling of 51012320557 in words is "fifty-one billion, twelve million, three hundred twenty thousand, five hundred fifty-seven".