168236411778 has 40 divisors (see below), whose sum is σ = 379056978300. Its totient is φ = 55768966560.

The previous prime is 168236411773. The next prime is 168236411779. The reversal of 168236411778 is 877114632861.

168236411778 is a `hidden beast` number, since 168 + 2 + 364 + 117 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 108190339929 + 60046071849 = 328923^2 + 245043^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (168236411773) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2839453 + ... + 2898096.

Almost surely, 2^168236411778 is an apocalyptic number.

168236411778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

168236411778 is an abundant number, since it is smaller than the sum of its proper divisors (210820566522).

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

168236411778 is a wasteful number, since it uses less digits than its factorization.

168236411778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5737744 (or 5737735 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The spelling of 168236411778 in words is "one hundred sixty-eight billion, two hundred thirty-six million, four hundred eleven thousand, seven hundred seventy-eight".