168115565511861 has 128 divisors (see below), whose sum is σ = 267385657098240. Its totient is φ = 93620117986560.

The previous prime is 168115565511799. The next prime is 168115565511869.

168115565511861 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 168115565511861 - 2¹¹ = 168115565509813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168115565511795 and 168115565511804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168115565511869) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 889749580 + ... + 889938506.

It is an arithmetic number, because the mean of its divisors is an integer number (2088950446080).

Almost surely, 2^{168115565511861} is an apocalyptic number.

168115565511861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168115565511861 is a deficient number, since it is larger than the sum of its proper divisors (99270091586379).

168115565511861 is a wasteful number, since it uses less digits than its factorization.

168115565511861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189336 (or 189314 counting only the distinct ones).

The product of its digits is 8640000, while the sum is 60.

The spelling of 168115565511861 in words is "one hundred sixty-eight trillion, one hundred fifteen billion, five hundred sixty-five million, five hundred eleven thousand, eight hundred sixty-one".