51876745538 has 4 divisors (see below), whose sum is σ = 77815118310. Its totient is φ = 25938372768.

The previous prime is 51876745523. The next prime is 51876745553. The reversal of 51876745538 is 83554767815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83554767815 = 5 ⋅16710953563.

It is an interprime number because it is at equal distance from previous prime (51876745523) and next prime (51876745553).

It can be written as a sum of positive squares in only one way, i.e., 48718642729 + 3158102809 = 220723^2 + 56197^2 .

It is a super-2 number, since 2×51876745538² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12969186383 + ... + 12969186386.

Almost surely, 2^51876745538 is an apocalyptic number.

51876745538 is a deficient number, since it is larger than the sum of its proper divisors (25938372772).

51876745538 is a wasteful number, since it uses less digits than its factorization.

51876745538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25938372771.

The product of its digits is 28224000, while the sum is 59.

The spelling of 51876745538 in words is "fifty-one billion, eight hundred seventy-six million, seven hundred forty-five thousand, five hundred thirty-eight".