168538026861 has 28 divisors (see below), whose sum is σ = 252729908700. Its totient is φ = 112341582720.

The previous prime is 168538026841. The next prime is 168538026901. The reversal of 168538026861 is 168620835861.

168538026861 is a `hidden beast` number, since 1 + 6 + 8 + 538 + 0 + 26 + 86 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23502729636 + 145035297225 = 153306^2 + 380835^2 .

It is not a de Polignac number, because 168538026861 - 2⁵ = 168538026829 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 168538026798 and 168538026807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168538026841) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 6358965 + ... + 6385413.

Almost surely, 2^168538026861 is an apocalyptic number.

It is an amenable number.

168538026861 is a deficient number, since it is larger than the sum of its proper divisors (84191881839).

168538026861 is an frugal number, since it uses more digits than its factorization.

168538026861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35208 (or 35193 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 168538026861 in words is "one hundred sixty-eight billion, five hundred thirty-eight million, twenty-six thousand, eight hundred sixty-one".