51165203280 has 80 divisors (see below), whose sum is σ = 167942268864. Its totient is φ = 12841461760.

The previous prime is 51165203213. The next prime is 51165203281. The reversal of 51165203280 is 8230256115.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51165203281) 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 15 ways as a sum of consecutive naturals, for example, 6266166 + ... + 6274325.

Almost surely, 2^51165203280 is an apocalyptic number.

It is an amenable number.

51165203280 is an abundant number, since it is smaller than the sum of its proper divisors (116777065584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51165203280 is a wasteful number, since it uses less digits than its factorization.

51165203280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12540524 (or 12540518 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 51165203280 its reverse (8230256115), we get a palindrome (59395459395).

The spelling of 51165203280 in words is "fifty-one billion, one hundred sixty-five million, two hundred three thousand, two hundred eighty".