165781561718060 has 24 divisors (see below), whose sum is σ = 348212752052256. Its totient is φ = 66299010888320.

The previous prime is 165781561718053. The next prime is 165781561718081. The reversal of 165781561718060 is 60817165187561.

It is a junction number, because it is equal to n+sod(n) for n = 165781561717984 and 165781561718002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850762577 + ... + 850957416.

It is an arithmetic number, because the mean of its divisors is an integer number (14508864668844).

Almost surely, 2^{165781561718060} is an apocalyptic number.

165781561718060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165781561718060 is an abundant number, since it is smaller than the sum of its proper divisors (182431190334196).

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

165781561718060 is a wasteful number, since it uses less digits than its factorization.

165781561718060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701724873 (or 1701724871 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 62.

The spelling of 165781561718060 in words is "one hundred sixty-five trillion, seven hundred eighty-one billion, five hundred sixty-one million, seven hundred eighteen thousand, sixty".