51665560115559 has 8 divisors (see below), whose sum is σ = 74186445294192. Its totient is φ = 31794190840320.

The previous prime is 51665560115551. The next prime is 51665560115581. The reversal of 51665560115559 is 95551106556615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51665560115559 - 2³ = 51665560115551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665560115551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662378975802 + ... + 662378975879.

It is an arithmetic number, because the mean of its divisors is an integer number (9273305661774).

Almost surely, 2^{51665560115559} is an apocalyptic number.

51665560115559 is a deficient number, since it is larger than the sum of its proper divisors (22520885178633).

51665560115559 is a wasteful number, since it uses less digits than its factorization.

51665560115559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324757951697.

The product of its (nonzero) digits is 30375000, while the sum is 60.

The spelling of 51665560115559 in words is "fifty-one trillion, six hundred sixty-five billion, five hundred sixty million, one hundred fifteen thousand, five hundred fifty-nine".