51436557808660 has 24 divisors (see below), whose sum is σ = 108016969926600. Its totient is φ = 20574585308544.

The previous prime is 51436557808619. The next prime is 51436557808667. The reversal of 51436557808660 is 6680875563415.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9953091141904 + 41483466666756 = 3154852^2 + 6440766^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51436557808592 and 51436557808601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51436557808667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10497222 + ... + 14596738.

It is an arithmetic number, because the mean of its divisors is an integer number (4500707080275).

Almost surely, 2^{51436557808660} is an apocalyptic number.

It is an amenable number.

51436557808660 is an abundant number, since it is smaller than the sum of its proper divisors (56580412117940).

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

51436557808660 is a wasteful number, since it uses less digits than its factorization.

51436557808660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4726875 (or 4726873 counting only the distinct ones).

The product of its (nonzero) digits is 145152000, while the sum is 64.

The spelling of 51436557808660 in words is "fifty-one trillion, four hundred thirty-six billion, five hundred fifty-seven million, eight hundred eight thousand, six hundred sixty".