65666550115560 has 128 divisors (see below), whose sum is σ = 200467995120000. Its totient is φ = 17203166032896.

The previous prime is 65666550115409. The next prime is 65666550115679. The reversal of 65666550115560 is 6551105566656.

65666550115560 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×65666550115560² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65666550115560.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7973074 + ... + 13960766.

It is an arithmetic number, because the mean of its divisors is an integer number (1566156211875).

Almost surely, 2^{65666550115560} is an apocalyptic number.

65666550115560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65666550115560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100233997560000).

65666550115560 is an abundant number, since it is smaller than the sum of its proper divisors (134801445004440).

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

65666550115560 is a wasteful number, since it uses less digits than its factorization.

65666550115560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989315 (or 5989311 counting only the distinct ones).

The product of its (nonzero) digits is 24300000, while the sum is 57.

The spelling of 65666550115560 in words is "sixty-five trillion, six hundred sixty-six billion, five hundred fifty million, one hundred fifteen thousand, five hundred sixty".