168918180165778 has 32 divisors (see below), whose sum is σ = 258677774502192. Its totient is φ = 82698824832000.

The previous prime is 168918180165751. The next prime is 168918180165793. The reversal of 168918180165778 is 877561081819861.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 51782084984529 + 117136095181249 = 7195977^2 + 10822943^2 .

It is a super-2 number, since 2×168918180165778² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114863728 + ... + 116325028.

Almost surely, 2^{168918180165778} is an apocalyptic number.

168918180165778 is a deficient number, since it is larger than the sum of its proper divisors (89759594336414).

168918180165778 is a wasteful number, since it uses less digits than its factorization.

168918180165778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463550.

The product of its (nonzero) digits is 325140480, while the sum is 76.

The spelling of 168918180165778 in words is "one hundred sixty-eight trillion, nine hundred eighteen billion, one hundred eighty million, one hundred sixty-five thousand, seven hundred seventy-eight".