51123427838 has 24 divisors (see below), whose sum is σ = 92281210200. Its totient is φ = 21154520688.

The previous prime is 51123427783. The next prime is 51123427847. The reversal of 51123427838 is 83872432115.

It is a super-2 number, since 2×51123427838² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8991428 + ... + 8997111.

It is an arithmetic number, because the mean of its divisors is an integer number (3845050425).

Almost surely, 2^51123427838 is an apocalyptic number.

51123427838 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51123427838 is a deficient number, since it is larger than the sum of its proper divisors (41157782362).

51123427838 is a wasteful number, since it uses less digits than its factorization.

51123427838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17988584 (or 17988577 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The spelling of 51123427838 in words is "fifty-one billion, one hundred twenty-three million, four hundred twenty-seven thousand, eight hundred thirty-eight".