51678463851 has 48 divisors (see below), whose sum is σ = 88303607808. Its totient is φ = 28499688000.

The previous prime is 51678463847. The next prime is 51678463861. The reversal of 51678463851 is 15836487615.

It is a happy number.

51678463851 is a `hidden beast` number, since 516 + 7 + 8 + 46 + 3 + 85 + 1 = 666.

It is not a de Polignac number, because 51678463851 - 2² = 51678463847 is a prime.

It is a super-2 number, since 2×51678463851² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51678463861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 680701 + ... + 752801.

It is an arithmetic number, because the mean of its divisors is an integer number (1839658496).

Almost surely, 2^51678463851 is an apocalyptic number.

51678463851 is a deficient number, since it is larger than the sum of its proper divisors (36625143957).

51678463851 is a wasteful number, since it uses less digits than its factorization.

51678463851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72512 (or 72509 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 51678463851 in words is "fifty-one billion, six hundred seventy-eight million, four hundred sixty-three thousand, eight hundred fifty-one".