51506875669 has 8 divisors (see below), whose sum is σ = 53298162360. Its totient is φ = 49716601536.

The previous prime is 51506875649. The next prime is 51506875699. The reversal of 51506875669 is 96657860515.

It can be written as a sum of positive squares in 4 ways, for example, as 34629488100 + 16877387569 = 186090^2 + 129913^2 .

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-51506875669 is a prime.

It is a super-2 number, since 2×51506875669² (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 (51506875649) 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 7 ways as a sum of consecutive naturals, for example, 148902 + ... + 353815.

It is an arithmetic number, because the mean of its divisors is an integer number (6662270295).

Almost surely, 2^51506875669 is an apocalyptic number.

It is an amenable number.

51506875669 is a deficient number, since it is larger than the sum of its proper divisors (1791286691).

51506875669 is a wasteful number, since it uses less digits than its factorization.

51506875669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506279.

The product of its (nonzero) digits is 13608000, while the sum is 58.

The spelling of 51506875669 in words is "fifty-one billion, five hundred six million, eight hundred seventy-five thousand, six hundred sixty-nine".