51866315451 has 24 divisors (see below), whose sum is σ = 75712107744. Its totient is φ = 34211243520.

The previous prime is 51866315443. The next prime is 51866315453. The reversal of 51866315451 is 15451366815.

It is a happy number.

51866315451 is a `hidden beast` number, since 5 + 1 + 8 + 6 + 631 + 5 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 51866315451 - 2³ = 51866315443 is a prime.

It is a super-2 number, since 2×51866315451² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51866315397 and 51866315406.

It is not an unprimeable number, because it can be changed into a prime (51866315453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4246285 + ... + 4258481.

It is an arithmetic number, because the mean of its divisors is an integer number (3154671156).

Almost surely, 2^51866315451 is an apocalyptic number.

51866315451 is a deficient number, since it is larger than the sum of its proper divisors (23845792293).

51866315451 is a wasteful number, since it uses less digits than its factorization.

51866315451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17171 (or 17168 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The spelling of 51866315451 in words is "fifty-one billion, eight hundred sixty-six million, three hundred fifteen thousand, four hundred fifty-one".